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Table 1 Characteristics of the study sample (N=348a)

From: Development of the “Treatment beliefs in knee and hip OsteoArthritis (TOA)” questionnaire

Demographic characteristics

 Age (years), mean (SD)

62.8 (12.3)

 Gender (female), n (%)

217 (63.1)

 Married or cohabiting, n (%)

273 (79.4)

 Currently employed, n (%)b

145 (44.1)

 Education level, n (%)c

  Low

62 (18.0)

  Middle

175 (50.9)

  High

107 (31.1)

Clinical characteristics

 Body Mass Index (BMI) (kg/m2), n(%)

  Normal weight (BMI <25)

106 (31.0)

  Overweight (BMI 25–30)

146 (42.7)

  Obese (BMI > 30)

90 (26.3)

 Duration of OA symptoms (years), mean (SD)b

11.1 (9.8)

 Affected joint(s), n (%)

  Hip

82 (24)

  Knee

169 (49.5)

  Hip and knee

91 (26.5)

 Comorbidities, n(%)d

  No comorbidities

141 (40.8)

  High blood pressure

97 (28.0)

  Heart disease

39 (11.2)

  Diabetes

27 (7.8)

  Lung disease

28 (8)

  Other

42 (12)

 Previous or current treatments for OA, n (%)d

  Pain medication

291 (85.3)

  Physiotherapy

234 (68.6)

  Injections

133 (39.0)

  Surgery

112 (32.8)

 WOMACe (Likert scale 0–4), unstandardized mean (SD), theoretical range

  Painb

10.0 (4.5), 0–20

  Stiffness

4.5 (2.0), 0–8

  Functioning

32.4 (14.8), 0–68

  Total (sum score)b

46.7 (20.0), 0–96

  1. a 3 respondents did not fill out these questions
  2. bMissing values > 5%: Currently employed = 6%; Duration of OA symptoms = 7%; WOMAC subscale pain = 5%, WOMAC total (sum score) = 8%
  3. cLow = no education, primary school, lower vocational education; Middle = secondary school, middle vocational education; High = higher vocational education, university
  4. dMore than 1 answer possible
  5. eWestern Ontario and McMaster Universities Arthritis Index. Higher scores reflect worse pain, stiffness and functioning