Figure 1.
Adjusted prevalence of osteoarthritis by body mass index (BMI) category. Overweight (BMI 25.0‐29.9 kg m−2); class I obesity (BMI 30.0‐34.9 kg m−2); class II obesity (BMI 35.0‐39.9 kg m−2); and class III obesity (BMI ≥ 40 kg m−2). *Adjusted for age, sex, and geographic region of residence; error bars represent 95% confidence intervals. Prevalence rates differed significantly across BMI categories/by BMI (P < .001 for Wald chi‐square test of joint significance of BMI categories; P < .001 for test of trend; except for upper‐extremity osteoarthritis)