Table 1.
Characteristics of cohort. Values are numbers (percentages) unless stated otherwise
| Characteristics | Framingham Osteoarthritis Study | Osteoarthritis Initiative |
|---|---|---|
| Mean (range) age (years)* | 63.5 (51-92) | 61.0 (45-79) |
| Women* | 528 (55.9) | 2532 (58.0) |
| White ethnicity* | 882 (93.2) | 3493 (80.0) |
| Mean body mass index | 27.9 | 28.3 |
| Frequent hip pain† | 255 (13.0) | 1433 (16.4) |
| Location of pain†: | ||
| Groin | 30 (1.6) | 237 (2.7) |
| Anterior thigh (front of leg) | 45 (2.4) | 157 (1.8) |
| Lateral (outside of leg) | 126 (6.8) | 949 (10.9) |
| Low back | 117 (6.3) | 605 (6.9) |
| Buttocks | 50 (2.7) | 490 (5.6) |
| Groin or anterior thigh | 59 (3.2) | 323 (3.7) |
| Internal rotation of hips†: | ||
| Frequent hip pain and painful internal rotation | 55 (2.7) | NA |
| Groin pain and painful internal rotation | 12 (0.7) | NA |
| Anterior thigh pain and painful internal rotation | 18 (1.0) | NA |
| Groin or anterior thigh pain and painful internal rotation | 21 (1.1) | NA |
*Person based prevalence (n=946 people in Framingham Osteoarthritis Study and 4366 people in Osteoarthritis Initiative).
†Hip based prevalence (n=1850 hips in Framingham Osteoarthritis Study and 8732 hips in Osteoarthris Initiative). Replacement hips excluded.