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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