The prevalence of rheumatic diseases in central Greece: a population survey
© Anagnostopoulos et al; licensee BioMed Central Ltd. 2010
Received: 20 January 2010
Accepted: 26 May 2010
Published: 26 May 2010
Rheumatic diseases are a major health and financial burden for societies. The prevalence of rheumatic diseases may change over time, and therefore, we sought to estimate the prevalence of rheumatic diseases in an adult population of central Greece.
In this prospective cross-sectional population survey, a random sample of adult population was drawn from poll catalogues of a region in central Greece. A postal questionnaire was sent to 3,528 people for the presence of any rheumatic disease. All positive cases were further confirmed by clinical examination using the American College of Rheumatoloy criteria. Multiple regression analysis was used to assess risk factors for rheumatic diseases.
The response rate was 48.3% (1,705 answers). Four hundred and twenty individuals (24.6%) had a rheumatic disease. The prevalence of rheumatoid arthritis was 0.58% (95% confidence interval [CI], 0.32-0.87), of psoriatic arthritis was 0.35% (95% CI, 0.33-1.13), of ankylosing spondylitis was 0.29% (95% CI, 0.28-0.94), of primary Sjögren's syndrome was 0.23% (95% CI, 0.22-0.75) and of systemic lupus erythematosus was 0.11% (95% CI, 0.11-0.37). One individual had systemic sclerosis (prevalence, 0.058%), 1 individual had dermatomyositis (prevalence, 0.058%; 95% CI, 0.05-0.18), 2 individuals had vasculitis (prevalence 0.11%; 95% CI, 0.11-0.37), 81 individuals had gout (prevalence, 4.75%; 95% CI, 4.41-5.13), and 304 individuals had osteoarthritis (OA) (prevalence 17.82%; 95% CI, 16.50-19.34). Gout was associated with male gender, diabetes mellitus, and hypertension, and OA was associated with age, female gender, and hypertension.
Rheumatic diseases are common in central Greece, affecting nearly a quarter of adult population. OA and gout are the most common joint disorders.
Rheumatic diseases are a common cause of disability, and a large public health burden . However, they may vary considerably in prevalence, mainly due to environmental factors. For example, the prevalence of systemic lupus erythematosus (SLE) or systemic sclerosis (SSc) differ in ethnic populations living in different geographical regions [2, 3]. Also, the prevalence of the rheumatic diseases may change over time. In a US population, the incidence of rheumatoid arthritis (RA) progressively declined since early 1960s, while the prevalence of gout doubled from 1969 to 1985, and it further increased by 80% from 1990 to 1999 . In Greece, two older studies on the prevalence of rheumatic diseases have taken place mainly in the north-west of the country [5, 6]. Therefore, we conducted a population survey for the prevalence of rheumatic diseases in central Greece.
A prospective two-step population-based cross-sectional survey was conducted from April 2007 to June 2008 in the Prefecture of Magnesia, a coastal region of central Greece. This region consists of a mainland with plains, mountains, and islands. The study involved a mailed questionnaire followed by confirmation clinical examination and tests, when needed, of individuals with a positive reply.
A sample of adults was drawn from poll catalogues of the Prefecture of Magnesia by systematic random sampling. The study involved 3,528 subjects (2% of the total 176,433 adult population in poll catalogues), consisting of 2% of the population in each sub-region, urban, rural, highlander, and islander population. According to their sub-region of residence, our sample consisted of 2,216 persons living in urban regions (2% of urban adult population), 723 persons living in rural regions (2% of rural adult population), 335 persons living in mainland highlands (2% of adult highlanders), and 254 persons living in islands (2% of islander adult population). Persons who could not be traced by mail (n = 200) were replaced using the same randomization process.
A postal questionnaire aimed at detecting any individual with current or previous diagnosis of a rheumatic disease. An explanatory letter was sent along with the questionnaire in a stamped self-addressed envelope to each one of randomly selected individuals. Persons were asked directly to report any diagnosis of: rheumatoid arthritis (RA), psoriatic arthritis (PsA), ankylosing spondylitis (AS), systemic lupus erythematosus (SLE), primary Sjogren's syndrome (pSS), systemic sclerosis (SSc), polymyositis (PM), dermatomyositis (DM), gout, osteoarthritis (OA), and vasculitis (e.g Do you suffer from rheumatoid arthritis? yes or no; Do you suffer from psoriatic arthritis? yes or no; etc). These "self-reported doctor-diagnosed" questions seemed to provide the best estimate for overall arthritis prevalence, with acceptable sensitivity and specificity, according to cognitive and validation studies .
Demographic and lifestyle variables included in the questionnaire
≥ 50 years
Urban, Rural, Highland, Island
No use: ≤ 3 drinks per year
Light drinker: < 2 drinks per day
Moderate drinker: 2-4 drinks per day
Heavy drinker: > 4 drinks per day
nonmanual: clerks, small business owners, merchants, university graduates, students, artists
manual: Industry workers, construction workers, cleaning, farmers, ranchers, fishermen, transporters
Out of work: unemployed, early retired
Yes: Current and/or in the past daily smoking
No: not ever daily smoking
Case detection through questionnaire was followed by case confirmation. Individuals who responded positively for any disease item were called in for evaluation by one rheumatologist (IA). A medical history was recorded and a careful clinical examination was carried out. Any previous laboratory test results or imaging findings were taken into account during the diagnostic procedure. For each rheumatic disease, established classification criteria of the American College of Rheumatology were used [7–15]. The study was approved by the Ethics Committee of our Hospital. All data remained confidential.
Statistical analysis was carried out using the SPSS v.13.0 statistics package. Categorical parameters were compared using the Fisher's exact test or Pearson chi-square test. Rheumatic diseases were tested for associations with gender, age, or other confounding parameters using univariate and multivariate logistic regression analysis. Associations were expressed in terms of unadjusted or adjusted odds ratio (OR) with 95% confidence interval (CI). An effect was considered significant, when p < 0.05.
One thousand seven hundred and five individuals (48.3%) (females, 54.1%; mean age ± standard deviation [SD], 51.08 ± 15.25 years) responded to questionnaire. Four hundred and twenty individuals (24.6%) reported a rheumatic disease and were invited for confirmation of diagnosis. Diagnoses had been made by Rheumatologists at University Hospitals, and private practice offices. All cases were confirmed.
Prevalence of rheumatic diseases in central Greece
(mean ± SD)
46.8 ± 14.9
43.5 ± 15.0
41.6 ± 2.2
Systemic lupus erythematosus
63.0 ± 7.8
65.6 ± 7.7
Variables assessed for association with gout
≥40 & <66
Urban and suburban
Variables assessed for association with osteoarthritis
≥40 & <66
Urban & suburban
Our study is a population-based postal survey using a random population sample. In Manchester, UK, a study by questionnaire followed by examination conducted in early 1990s, showed that the prevalence of RA was 0.3% in blacks and 0.8% in whites . In Halmstad, Sweden, a study using a questionnaire of 3,928 persons and review of medical records of persons who did not reply, found a prevalence of RA to be 0.51% . In Spain and Italy, the prevalence of RA was 0.3-0.5% [18, 19]. In our study, the prevalence of RA lies between those found by a retrospective study (0.35%)  and a cross-sectional study (0.68%)  in Greece.
The prevalence of AS varies according to the frequency of HLA-B27 in the general population. It has been reported 0.1% in African blacks and Eskimos, 0.5%-1% in whites of the USA and UK, and 6.0% in Amerindians . In a retrospective study, using medical records of a University hospital in northern Norway in 1990, the prevalence of AS was 0.21% . In Ancona, Italy, a study, using a questionnaire followed by review of medical records and examination in 2007, showed a prevalence of AS of 0.37%, and that of SpA of 1.1% . In north-west Greece a study, using medical records of hospitals and Rheumatology Private Practices between 1983 and 2002, has found AS prevalence to be 0.03%, with HLA-B27 positivity present in 80.5% of patients . Another study in Greece in 2002 showed a prevalence of AS of 0.24% and that of SpA of 0.49% . In Izmir, Turkey, the prevalence of AS was 0.49% and that of SpA was 1.05% .
The prevalence of PsA in a study based on medical records in the Olmsted county, Minesota, USA in 1992 was 0.1% [4, 26] and in another study conducted by phone in a random US population sample was 0.25% . In the latter study, the prevalence of psoriasis was 2.2% . In western Norway, a study using medical records of Rheumatology centers covering 442,000 persons between 1999 and 2002, found the prevalence of AS to be 0.19% . In Ancona, Italy, a study using questionnaire in 2007 showed a prevalence of PsA of 0.42% . Our PsA prevalence estimate is similar to that reported earlier in Greece (0.17%) .
Our estimate of SLE prevalence (0.11%) is slightly higher than that reported in a study using medical records of Hospitals and rheumatology practices in northwest Greece in 2001 (0.009% for men, 0.069% for women) . The prevalence of SLE was 0.05% in a study using physician billing and hospital database in Quebec, Canada , and 0.01% in males and 0.071% in females in a study using General Practice Research Database in UK . In northern Spain, a study using database of the single Immunology laboratory of a region, found SLE prevalence to be 0.034% , and in Northern Italy, a study using hospital medical records reported SLE prevalence 0.058% .
The prevalence of pSS in our study (0.23%) is in agreement with those of two previous community-based studies in Greece [34, 35]. In Norway, the prevalence of pSS, as detected by postal questionnaire, was 0.22% in adult ages 40-44 years and 1.4% in the adult ages 71-74 years , and in UK the prevalence of pSS was 0.33% .
Our finding that only one person was diagnosed with SSc, DM, giant cell arteritis, hypocoplementemic urticarial vasculitis precludes any comment on the prevalence of these diseases. However, it is worth mentioning that there are geographical clusters of SSc which suggest an environmental aetiology for the disease .
The prevalence of gout increases with age, is higher in men than women, and is on the increase. In adult age >75 years in USA, the prevalence of gout increased from 2.1% in 1990, to 4.1% in 1999 . The respective values for men were 2.5%, and 6.4% . In the US National Health and Nutrition Examination Survey (NHANES) III between 1988 and 1994, the highest prevalence (8%; males, 11.6%; females, 5.2%) was found in adult ages 70-79 years [39, 40]. In a UK study using General Practitioner database, the prevalence of gout was 0.3% in the 1970s, and 0.95% in the 1990s . Results from the UK General Practice database during the period 1990-1999 showed relatively constant incidence rates. In 1999 the prevalence of gout was 1.4% in adult population, and 7.0% in males over 65 years of age . A retrospective study using medical records of General Practitioners in UK and Germany between 2000 and 2005 found the prevalence of gout to be 1.4% (mean age, 60 years) . In China, the prevalence of hyperuricemia and gout varied among different regions. The prevalence of gout was 11.7% in Taiwanese aborigines and 3.0% in ethnic Taiwanese . Our estimate of the prevalence of gout is much higher than that reported in the general Greek population (0.47%) a few years ago . This may be explained by the relatively old age of our gouty patients (mean age, 63 years), and the changing diet and lifestyle. High seafood consumption, which is a risk factor for gout , is prevalent in this coastal region of Greece. Our study has found gout to be associated with male gender, hypertension, and diabetes mellitus. Since hypertension and type II diabetes mellitus are components of the metabolic syndrome or insulin resistance syndrome, our gouty men are likely to have this syndrome that carries an increased cardiovascular risk .
Epidemiological studies of OA have inherent problems due to lack of association between symptoms and radiographic findings that may underestimate OA prevalence. Generally, the prevalence of OA is associated with age and is higher in women. The prevalence of symptomatic hand OA, verified by x-rays, in the Framingham study was 6.8% (3.8% in men, 9.2% in women) whereas in adults age > 71 years was 13.4% in men and 26.2% in women . The prevalence of symptomatic knee OA was 4.9%, and increased to 6.7% (5.9% in men, 7.2% in women) in adults aged > 45 years . In the US NHANES III study, the prevalence of symptomatic knee OA in adults age >60 years was 12.1% , and in the Jonston county, northern Carolina, USA, it was 16.7% in adults age > 45 years . In the latter study, the prevalence of symptomatic hip OA was 9.2% . In British Columbia, Canada, database from Health centers and Hospitals between 1991 and 2001 showed a prevalence of symptomatic OA in 2001 of 10.0% in adult ages 45-49 years, whereas 32% of men and 40% of women aged 70 years had OA . In France, a phone survey in a random population sample of adults aged 40-75 years found the prevalence of knee OA and hip OA to be 7.6% and 5%, respectively . In Spain, the frequency of symptomatic hand OA was 6.2% and knee OA 10.2% . In our study, there is a low frequency of hand OA. Individuals with hand OA may have mild symptoms and do not seek medical advice. Therefore, these patients did not report their condition. The relatively low prevalence of OA in manual workers, compared to non-manual workers, may be attributed to women as house-wives. These women, included in non-manual workers, may have not only house duties but they may also work manually in the fields, a common practice in the country. A previous study in Greece showed a prevalence of symptomatic hand OA of 2.0%, knee OA 6.0%, and hip OA of 0.9% .
Radiographic OA, defined by the presence of osteophytes is much prevalent than symptomatic OA. In the Framingham study, the prevalence of radiographic hand OA was 27.2% (25.9% in men, 28.2% in women) . The prevalence of radiographic knee OA was 13.8%, and increased to 19.2% in the > 45 year-old age group . In the Jonston county study, the prevalence of radiographic OA in the >45 year age group was 27.8% (24.3% in men, 30.15% in women) and hip OA was 27.8% [40, 50]. In the US NHANES III study, the prevalence of radiographic knee OA was 37.4% (31.2% in men, 42.1% in women) in the > 60 year-old age group . In Holland, radiographic hand OA was found in 67% of women and 54.8% of men > 55 years of age .
As with other studies, our study has limitations to consider. Firstly, our study relied on patient self-reporting of a physician diagnosis of a disease as opposed to ascertaining a diagnosis through medical records. Additionally, our study may have missed patients with mild arthritis, such as OA, that did not come to medical attention. However, our estimates are generally close to those studies that used medical records to ascertain rheumatic disease diagnoses. Furthermore, self-report of chronic disease has been found accurate . Secondly, our study had a relatively low response rate. However, similar response rate has also been reported by other postal surveys  and may be attributed to the increasingly use of questionnaires (postal or by phone) in public marketing.
Rheumatic diseases are common in central Greece, affecting nearly a quarter of adult population. OA and gout are the most common joint disorders.
Abbreviations are defined in the text
The study was funded by ELKE (No 2664). The funding body had no role in study design, in the collection, analysis, and interpretation of data, in the writing of the manuscript, and in the decision to submit the manuscript for publication.
- Yelin E, Cisternas M, Pasta D, Trupin L, Murphy L, Helmick CG: Medical care expenditures and earning losses of persons with arthritis and other rheumatic conditions in the United States in 1997:total and incremental estimates. Arthritis Rheum. 2004, 50: 2317-26. 10.1002/art.20298.View ArticlePubMedGoogle Scholar
- Fessel WJ: Epidemiology of systemic lupus erythematosus. Rheum Dis Clin North Am. 1988, 14: 15-23.PubMedGoogle Scholar
- Chifflot H, Fautrel B, Sordet C, Chatelus E, Sibilia J: Incidence and prevalence of systemic sclerosis: a systematic literature review. Sem Arthritis Rheum. 2008, 37: 223-35. 10.1016/j.semarthrit.2007.05.003.View ArticleGoogle Scholar
- Helmick CG, Felson DT, Lawrence RC, Gabriel S, Hirsch R, Kent Kwoh C, Liang MH, Kremers HM, Mayes MD, Merkel PA, Pillemer SR, Reveille JD, Stone JH: Estimates of the prevalence of arthritis and other rheumatic conditions in the United States. Part I. Arthritis Rheum. 2008, 58: 15-25. 10.1002/art.23177.View ArticlePubMedGoogle Scholar
- Drosos AA, Alamanos I, Voulgari PV, Psychos DN, Katsaraki A, Papadopoulos I, Dimou G, Siozos C: Epidemiology of adult rheumatoid arthritis in northwest Greece 1987-1995. J Rheumatol. 1997, 24: 2129-33.PubMedGoogle Scholar
- Andrianakos A, Trontzas P, Christogiannis F, Dantis P, Voudouris C, Georgountzos A, Kaziolas G, Vafiadou E, Pantelidou K, Karamitsos D, Kontelis L, Krachtis P, Nikolia Z, Kaskani E, Tavaniotou E, Antoniades C, Karanikolas G, Kontoyanni A: Prevalence of rheumatic diseases in Greece: a cross-sectional population based epidemiological study. The ESORDIG Study. J Rheumatol. 2003, 30: 1589-601.PubMedGoogle Scholar
- Wallace SL, Robinson H, Masi ET, Decker JL, Mc Carty DJ, Yu TF: Preliminary criteria for the classification of the acute arthritis of primary gout. Arthritis Rheum. 1977, 20: 895-900. 10.1002/art.1780200320.View ArticlePubMedGoogle Scholar
- Bird HA, Esselinckx W, Dixon AS, Mowat AG, Wood PH: An evaluation of criteria for polymyalgia rheumatica. Ann Rheum Dis. 1979, 38: 434-9. 10.1136/ard.38.5.434.View ArticlePubMedPubMed CentralGoogle Scholar
- Subcommittee for Scleroderma Criteria of the American Rheumatism Association Diagnostic and Therapeutic Criteria Committee: Preliminary criteria for the classification of systemic sclerosis (scleroderma). Arthritis Rheum. 1980, 23: 581-90. 10.1002/art.1780230510.View ArticleGoogle Scholar
- Tan EM, Cohen AS, Fries JF, Masi AT, McShane DJ, Rothfield NF, Schaller JG, Talal N, Winchester RJ: The 1982 revised criteria for the classification of systemic lupus erythematosus. Arthritis Rheum. 1982, 25: 1271-7. 10.1002/art.1780251101.View ArticlePubMedGoogle Scholar
- Arnett FC, Edworthy SM, Bloch DA, McShane DJ, Fries JF, Cooper NS, Healey LA, Kaplan SR, Liang MH, Luthra HS: The American Rheumatism Association 1987 revised criteria for the classification of rheumatoid arthritis. Arthritis Rheum. 1998, 31: 315-24. 10.1002/art.1780310302.View ArticleGoogle Scholar
- Hunder GG, Bloch DA, Mitchell BA, Stevens MB, Arend WP, Calabrese LH, Edworthy SM, Fauci AS, Leavitt RY, Lie JT: The American College of Rheumatology1990 criteria for the classification of giant cell arteritis. Arthritis Rheum. 1990, 33: 1122-8.View ArticlePubMedGoogle Scholar
- Dougados M, Linden van der S, Juhlin R, Huitfeldt B, Amor B, Calin A, Cats A, Dijkmans B, Olivieri I, Pasero G: The European Spondyloarthropathy Study Group preliminary criteria for spondyloarthropathy. Arthritis Rheum. 1991, 34: 1218-27. 10.1002/art.1780341003.View ArticlePubMedGoogle Scholar
- Vitali C, Bombardieri S, Jonsson R, Moutsopoulos HM, Alexander EL, Carsons SE, Daniels TE, Fox PC, Fox RI, Kassan SS, Pillemer SR, Talal N, Weisman MH: Classification criteria for Sjogren's syndrome: a revised version of the European criteria proposed by the American-European consensus group. Ann Rheum Dis. 2002, 61: 554-58. 10.1136/ard.61.6.554.View ArticlePubMedPubMed CentralGoogle Scholar
- Taylor W, Gladman D, Helliwell P, Marchesoni A, Mease P, Mielants H, for the CASPAR study group: Classification criteria for psoriatic arthritis: development of new criteria from a large international study. Arthritis Rheum. 2006, 54: 2665-73. 10.1002/art.21972.View ArticlePubMedGoogle Scholar
- MacGregor AJ, Riste LK, Hazes JMW, Silman AJ: Low prevalence of rheumatoid arthritis in black-Caribbeans compared with whites in inner city Manchester. Ann Rheum Dis. 1994, 53: 293-7. 10.1136/ard.53.5.293.View ArticlePubMedPubMed CentralGoogle Scholar
- Simonsson M, Bergman S, Jacobsson LTH, Petersson IF, Svensson B: The prevalence of rheumatoid arthritis in Sweden. Scand J Rheumatol. 1999, 28: 340-3. 10.1080/03009749950155319.View ArticlePubMedGoogle Scholar
- Cimmino MA, Parisi M, Moggiana G, Mela GS, Accardo S: Prevalence of rheumatoid arthritis in Italy: the Chiavari study. Ann Rheum Dis. 1998, 57: 315-8. 10.1136/ard.57.5.315.View ArticlePubMedPubMed CentralGoogle Scholar
- Carmona L, Villaverde V, Hernandez-Garcia C, Ballina J, Gabriel R, Laffon A, for the EPISER study group: The prevalence of rheumatoid arthritis in the general population of Spain. Rheumatology. 2002, 41: 88-95. 10.1093/rheumatology/41.1.88.View ArticlePubMedGoogle Scholar
- Andrianakos A, Trontzas P, Christoyiannis F, Kaskani E, Nikolia Z, Tavaniotou E, Georgountzos A, Krachtis P, for the ESORDIG study group: Prevalence and management of rheumatoid arthritis in the general population of Greece-the ESORDIG study. Rheumatology. 2006, 45: 1549-54. 10.1093/rheumatology/kel140.View ArticlePubMedGoogle Scholar
- Baum J, Ziff M: The rarity of ankylosing spondylitis in the black race. Arthritis Rheum. 1971, 14: 12-8. 10.1002/art.1780140103.View ArticlePubMedGoogle Scholar
- Backland G, Nossent HC, Gran JT: Incidence and prevalence of ankylosing spondylitis in Northern Norway. Arthritis Rheum. 2005, 53: 850-5. 10.1002/art.21577.View ArticleGoogle Scholar
- de Angelis R, Salalfi F, Grassi W: Prevalence of spondyloarthropathies in an Italian population sample: a regional community-based study. Scand J Rheumatol. 2007, 36: 14-21. 10.1080/03009740600904243.View ArticlePubMedGoogle Scholar
- Alamanos Y, Papadopoulos NG, Voulgari PV, Karakatsanis A, Siozos C, Drosos AA: Epidemiology of ankylosing spondylitis in northwest Greece, 1983-2002. Rheumatology. 2004, 43: 615-8. 10.1093/rheumatology/keh133.View ArticlePubMedGoogle Scholar
- Onen F, Akar S, Birlik M, Sari I, Khan MA, Gourler O, Ergor A, Manisali M, Akkoc N: Prevalence of ankylosing spondylitis and related spondyloarthritides in an urban area of Izmir, Turkey. J Rheumatol. 2008, 35: 305-9.PubMedGoogle Scholar
- Shbeeb M, Uramoto KM, Gibson LE, O' Fallon WM, Gabriel SE: The epidemiology of psoriatic arthritis in Olmsted County, Minesota, USA, 1982 - 1991. J Rheumatol. 2000, 27: 1247-50.PubMedGoogle Scholar
- Gelfand JM, Gladman DD, Mease PJ, Smith N, Margolis DJ, Nijsten T, Stern RS, Feldman SR, Rolstad T: Epidemiology of psoriatic arthritis in the population of the United States. J Am Acad Dermatol. 2005, 53: 573-77. 10.1016/j.jaad.2005.03.046.View ArticlePubMedGoogle Scholar
- Madland TM, Apalset EM, Johannessen AE, Rossebo B, Brun JG: Prevalence, disease manifestations, and treatment of psoriatic arthritis in Western Norway. J Rheumatol. 2005, 32: 1918-22.PubMedGoogle Scholar
- Alamanos Y, Voulgari PV, Siozos C, Katsimpri P, Tsintzos S, Dimou G, Politi EN, Rapti A, Laina G, Drosos AA: Epidemiology of systemic lupus erythematosus in northwest Greece 1982-2001. J Rheumatol. 2003, 30: 731-735.PubMedGoogle Scholar
- Bernatsky S, Joseph L, Pineau CA, Tamblyn R, Feldman DE, Clarke AE: A population-based assessment of systemic lupus erythematosus incidence and prevalence results and implications of using administrative data for epidemiological studies. Rheumatology. 2007, 46: 1814-1818. 10.1093/rheumatology/kem233.View ArticlePubMedGoogle Scholar
- Nightngale AL, Farmer RD, de Vries CS: Systemic lupus erythematosus prevalence in UK: methodological issues when using the General Practice Research Database to estimate frequency of chronic relapsing-remitting disease. Pharmacoepidimiol Drug Saf. 2007, 16: 144-51. 10.1002/pds.1253.View ArticleGoogle Scholar
- Lopez P, Mozo L, Gutierrez C, Suarez A: Epidemiology of systemic lupus erythematosus in a northern Spanish population: gender and age influence on immunological features. Lupus. 2003, 12: 860-865. 10.1191/0961203303lu469xx.View ArticlePubMedGoogle Scholar
- Govoni M, Gastellino G, Bosi S, Napoli N, Trotta F: Incidence and prevalence of systemic lupus erythematosus in a district of north Italy. Lupus. 2006, 15: 110-113. 10.1191/0961203306lu2235xx.View ArticlePubMedGoogle Scholar
- Dafni UG, Tzioufas AG, Staikos P, Skopouli FN, Moutsopoulos HM: Prevalence of Sjogren's syndrome in a closed rural community. Ann Rheum Dis. 1997, 56: 521-525. 10.1136/ard.56.9.521.View ArticlePubMedPubMed CentralGoogle Scholar
- Trontzas PI, Andrianakos AA: Sjogren's syndrome: a population based study of prevalence in Greece. The ESORDIG study. Ann Rheum Dis. 2005, 64: 1240-41. 10.1136/ard.2004.031021.View ArticlePubMedPubMed CentralGoogle Scholar
- Haugen AJ, Peen E, Hulten B, Johannessen AC, Brun JG, Halse AK, Haga HJ: Estimation of the prevalence of primary Sjogren's syndrome in two age-different community-based populations using the two sets of classification criteria: the Hordaland Health Study. Scand J Rheumatol. 2008, 37: 30-4. 10.1080/03009740701678712.View ArticlePubMedGoogle Scholar
- Thomas E, Hay EM, Hajeer A, Silman AJ: Sjogren's syndrome: a community based study of prevalence and impact. Br J Rheumatol. 1998, 37: 1069-76. 10.1093/rheumatology/37.10.1069.View ArticlePubMedGoogle Scholar
- Wallace KL, Riedel AA, Joseph-Ridge N, Wortmann R: Increasing prevalence of gout and hyperuricemia over 10 years among older adults in a managed care population. J Rheumatol. 2004, 31: 1582-7.PubMedGoogle Scholar
- Kramer HM, Curhan G: The association between gout and nephrolithiasis: the National health and Nutrition Examination Survey III, 1988-1994. Am J Kidney Dis. 2002, 40: 37-42. 10.1053/ajkd.2002.33911.View ArticlePubMedGoogle Scholar
- Lawrence RC, Felson DT, Helmick CG, Arnold LM, Choi H, Deyo RA, Gabriel S, Hirsch R, Hochberg MC, Hunder GG, Jordan JM, Katz JN, Kremers HM, Wolfe F: Estimates of the prevalence of arthritis and other rheumatic conditions in the United States: Part II. Arthritis Rheum. 2008, 58: 26-35. 10.1002/art.23176.View ArticlePubMedPubMed CentralGoogle Scholar
- Harris CM, Lloyd DCEF, Lewis J: The prevalence and prophylaxis of gout in England. J Clin Epidemiol. 1995, 48: 1153-58. 10.1016/0895-4356(94)00244-K.View ArticlePubMedGoogle Scholar
- Mikuls TR, Farrar JT, Bilker WB, Fernandes S, Schumacher HR, Saag KG: Gout epidemiology: results from the UK general practice research database, 1990-1999. Ann Rheum Dis. 2005, 64: 267-272. 10.1136/ard.2004.024091.View ArticlePubMedPubMed CentralGoogle Scholar
- Annemans L, Spaepen E, Gaskin M, Bonnemaire M, Malier V, Gilbert T, Nuki G: Gout in the UK and Germany: prevalence, co-morbidities and management in general practice 2000-2005. Ann Rheum Dis. 2008, 67: 960-6. 10.1136/ard.2007.076232.View ArticlePubMedGoogle Scholar
- Nan H, Qiao Q, Dong Y, Gao W, Tang B, Qian R, Tuomilehto J: The prevalence of hyperuricemia in a population of the coastal city of Qingdao, China. J Rheumatol. 2006, 33: 1346-50.PubMedGoogle Scholar
- Saag KG, Choi H: Epidemiology, risk factors, and lifestyle modification for gout. Arthritis Res Ther. 2006, 8 (Suppl 1): S2-7. 10.1186/ar1907.View ArticlePubMedPubMed CentralGoogle Scholar
- Puig JG, Martinez MA: Hyperuricemia, gout and the metabolic syndrome. Curr Opin Rheumatol. 2008, 20: 187-91. 10.1097/BOR.0b013e3282f4b1ed.View ArticlePubMedGoogle Scholar
- Zhang Y, Niu J, Kelly-Hayes M, Chaisson CE, Aliabadi P, Felson DT: Prevalence of symptomatic hand osteoarthritis and its impact on functional status among the elderly. The Framingham study. Am J Epidemiol. 2002, 156: 1021-7. 10.1093/aje/kwf141.View ArticlePubMedGoogle Scholar
- Felson DT, Naimatk A, Anderson J, Kazis L, Castelli W, Meenan RF: The prevalence of knee osteoarthritis in the elderly: the Framingham osteoarthritis study. Arthritis Rheum. 1987, 30: 914-18. 10.1002/art.1780300811.View ArticlePubMedGoogle Scholar
- Dilon CF, Rasch EK, Gu Q, Hirsch R: Prevalence of knee osteoarthritis in the United States: arthritis data from the third National Health and Nutrition Examination Survey 1991-94. J Rheumatol. 2006, 33: 2271-79.Google Scholar
- Jordan JM, Helmick CG, Renner JR, Luta G, Dragomir AD, Woodard J, Fang F, Schwartz TA, Abbate LM, Callahan LF, Kalsbeek WD, Hochberg MC: Prevalence of knee symptoms and radiographic and symptomatic knee osteoarthritis in African Americans and Caucasians; the Johnston county osteoarthritis project. J Rheumatol. 2007, 34: 172-80.PubMedGoogle Scholar
- Kopec JA, Rahman MM, Berthelot JM, Le Petit C, Aghajanian J, Sayre EE, Cibere J, Anis AH, Badley EM: Descriptive epidemiology of osteoarthritis in British Columbia, Canada. J Rheumatol. 2007, 34: 386-93.PubMedGoogle Scholar
- Roux CH, Saraux A, Mazieres B, Pouchot J, Morvan J, Fautrel B, Testa J, Fardellone P, Rat AC, Coste J, Guillemin F, Euller-Ziegler L: Screening for hip and knee osteoarthritis in the general population: predictive value of a questionnaire and prevalence estimates. Ann Rheum Dis. 2008, 67: 1406-11. 10.1136/ard.2007.075952.View ArticlePubMedGoogle Scholar
- Carmona L, Ballina J, Gabriel R, Laffon A, for the EPISER study group: The burden of musculoskeletal diseases in the general population of Spain: results from a national survey. Ann Rheum Dis. 2001, 60: 1040-45. 10.1136/ard.60.11.1040.View ArticlePubMedPubMed CentralGoogle Scholar
- Andrianakos AA, Kontelis LK, Karamitsos DE, Aslanidis SI, Georgountzos AI, Kaziolas GO, Pantelidou KV, Vafiadou EV, Dantis PC, for the ESORDIG study group: Prevalence of symptomatic knee, hand, and hip osteoarthritis in Greece. The ESORDIG study. J Rheumatol. 2006, 33: 2507-13.PubMedGoogle Scholar
- Dalaghin S, Bierma-Zeinstra SMA, Ginai AZ, Pols HAP, Hazes JMW, Koes BW: Prevalence and pattern of radiographic hand osteoarthritis and association with pain and disability (the Rotterdam study). Ann Rheum Dis. 2005, 64: 682-87. 10.1136/ard.2004.023564.View ArticleGoogle Scholar
- Martin LM, Leff M, Calogne N, Garrett C, Nelson DE: Validation of self-report chronic conditions and health services in a managed care population. Am J Prev Med. 2000, 18: 215-18. 10.1016/S0749-3797(99)00158-0.View ArticlePubMedGoogle Scholar
- Grotle M, Hagen KB, Natvig FA, Dahl FA, Kvien TK: The prevalence and burden of osteoarthritis: results from a population survey in Norway. J Rheumatol. 2008, 35: 677-84.PubMedGoogle Scholar
- The pre-publication history for this paper can be accessed here:http://www.biomedcentral.com/1471-2474/11/98/prepub
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