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Baseline characteristics of subjects.
| Cases | Controls | P value | |
|---|---|---|---|
| Subjects, number | 469 | 522 | — |
| Females, number (%) | 356 (75.9) | 120 (23.0) | P < 0.001* |
| Mean age, y (SD) | 57.3 ± 10.9 | 56.4 ± 9.8 | P = 0.473 |
| Mean BMI, kg/m2 (SD) | 26.1 ± 3.9 | 24.3 ± 2.8 | P < 0.001 |
| Kellgren-Lawrence grading | |||
| Grade 2, number (%) | 255 (54.5) | 0 (0.0) | — |
| Grade 3, number (%) | 119 (25.3) | 0 (0.0) | — |
| Grade 4, number (%) | 95 (20.2) | 0 (0.0) | — |
No.: number; y: years; SD: standard deviation.
*Pearson chi-square test.
