Table 1 Baseline characteristics of participants in each cohort
From: Researchers in rheumatology should avoid categorization of continuous predictor variables
| Â | Main cohort (The cohort for progression of knee and hip osteoarthritis and total joint replacement) | Frequent knee pain cohort | Frequent hip pain cohort | Any knee pain cohort | Any hip pain cohort |
|---|---|---|---|---|---|
No of participant s | n  = 3378 | n  = 3108 | n  = 3312 | n  = 2065 | n  = 3022 |
Age, years | 61.1 ± 9.2 | 61.2 ± 9.2 | 61.1 ± 9.2 | 61.9 ± 9.3 | 61.2 ± 9.3 |
Sex | |||||
 Male | 1439 (42.6) | 1343 (43.2) | 1416 (42.7) | 906 (43.9) | 1333 (44.1) |
 Female | 1939 (57.4) | 1765 (56.8) | 1896 (57.3) | 1159 (56.1) | 1689 (55.9) |
BMI, kg/m2 | 28.1 ± 4.6 | 28.0 ± 4.5 | 28.1 ± 4.6 | 27.7 ± 4.4 | 28.1 ± 4.6 |
Missing | 0 | 0 | 0 | 0 | 0 |