Table 1.
Clinical characteristics.
| Characteristic | Case control respondents at year 19 (n = 707) | Control group respondents at year 19 without TJA (n = 676) | Case group respondents at year 19 with TKA (n = 31) |
|---|---|---|---|
| Baseline age, years, median (IQR) | 53 (48,58) | 53 (48,58) | 53 (51,59) |
| Baseline weight, kg, median (IQR) | 64.8 (58.5,72.3) | 64.4 (58.3,72) | 68.6 (64,74.8)* |
| Height, m, mean (SD) | 1.62 (0.06) | 1.62 (0.06) | 1.62 (0.06) |
| BMI at age 20, kg/m2, median (IQR) | 20.9 (19.3,22.8) n = 705 | 21.4 (19.8,23.5) n = 674 | 21.6 (19.5,23.5) |
| BMI at Year 1 (baseline), kg/m2, median (IQR) | 24.7 (22.6,27.3) | 24.5 (22.6,27.2) | 26.5 (24.1,28.8)* |
| BMI at year 5, kg/m2, median (IQR) | 25.6 (23.1,28.5) n = 650 | 25.5 (23.0,28.3) n = 621 | 27.4 (25.1,29.4)* n = 29 |
| BMI at year 10, kg/m2, median (IQR) | 26.3 (23.6,29.3) n = 679 | 26.1 (23.5,29.3) n = 651 | 27.5 (24.9,31.3) n = 28 |
| Baseline activity score, range = [3,12], median (IQR) | 7 (6,8) n = 702 | 7 (6,8) n = 670 | 7 (6,8) |
| Baseline parity, range = [0,9], median(IQR) | 2 (1,3) | 2 (1,3) | 2 (1,3) |
| Age of menopause, years, median (IQR) | 49 (45,51) n = 519 | 49 (45,51) n = 491 | 47.5 (42,51) n = 28 |
| Smoking,% never, ever | 56.6,43.4 | 56.8,43.2 | 51.6,48.4 |
*p-values < 0.05, for cases verses controls.