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Table 6 Association between body mass index and SF-36 physical function in observed target population and CAS(K) clinic attenders*

From: The Knee Clinical Assessment Study – CAS(K). A prospective study of knee pain and knee osteoarthritis in the general population: baseline recruitment and retention at 18 months

  Poor physical function Good physical function Odds ratio (95% CI†) Unadjusted Odds ratio (95% CI†) Adjusted‡
Reported knee pain in last 12 months (n = 3106)     
   Self-reported body mass index     
Underweight/normal (<25·0 kg/m2) 550 321 1.00 1.00
Overweight (25·0–29·9 kg/m2) 750 420 1.04 (0.9, 1.3) 1.38 (1.1, 1.7)
Obese (>29·9 kg/m2) 520 164 1.85 (1.5, 2.3) 2.71 (2.1, 3.4)
Attended research clinic (n = 819)     
   Self-reported body mass index     
Underweight/normal (<25·0 kg/m2) 100 83 1.00 1.00
Overweight (25·0–29·9 kg/m2) 216 136 1.32 (0.9, 1.9) 1.41 (1.0, 2.1)
Obese (>29·9 kg/m2) 164 46 2.96 (1.9, 4.6) 3.64 (2.3, 5.8)
  1. * Both SF-36 physical function scores and self-reported body mass index are subject to missing data.
  2. † – 95% confidence interval
  3. ‡ – Adjusted for gender and age-group (50–59 yrs, 60–69 yrs, 70–79 yrs, 80+ yrs)