Table 4. Self-report prevalent diabetes status at recruitment in relation to risk of total knee replacement stratified by body mass index (BMI) level.
| N | Case | Person-years | HRa (95% CI) | |
|---|---|---|---|---|
| BMI <23 kg/m2 | ||||
| No diabetes | 28,289 | 439 | 415,275 | 1.00 |
| Diabetes | 2,056 | 18 | 24,266 | 0.56 (0.35–0.90) |
| BMI 23 to <27.5 kg/m2 | ||||
| No diabetes | 24,499 | 1,023 | 361,312 | 1.00 |
| Diabetes | 2,857 | 73 | 35,172 | 0.66 (0.52–0.84) |
| BMI ≥27.5 kg/m2 | ||||
| No diabetes | 4,670 | 395 | 67,160 | 1.00 |
| Diabetes | 758 | 25 | 9,578 | 0.45 (0.30–0.67) |
aHRs were adjusted for age at recruitment (years); year of recruitment (1993–1995, 1995–1998); dialect group (Hokkien, Cantonese), level of education (no formal education, primary school, secondary school or higher), BMI (kg/m2), self-reported histories of physician-diagnosed coronary heart disease or stroke, smoking status (never, former, or current), numbers of hours per week spent in moderate physical activity, vigorous work, and strenuous sports.