Table 2. Number of cases of diabetes, standardised diabetes incidence rates and adjusted hazard ratios by BMI and waist circumference at baseline.
| Men |
Women |
|||||
|---|---|---|---|---|---|---|
| No. of cases | Standardised rate per 100 000 (95% CI)* |
Hazard ratio (95% CI)† |
No. of cases | Standardised rate per 100 000 (95% CI)* |
Hazard ratio (95% CI)† |
|
| BMI (kg/m2) | ||||||
| Underweight (<18.5) | 104 | 112.4 (84.7-140.2) | 0.64 (0.52-0.77) | 182 | 117.9 (89.9-145.9) | 0.61 (0.53-0.71) |
| Normal weight (18.5-24.9) | 2183 | 195.4 (188.6-202.2) | 1.00 (0.96-1.05) | 3492 | 200.1 (193.2-206.9) | 1.00 (0.97-1.04) |
| Overweight (25.0-29.9) | 2366 | 537.3 (519.4-555.1) | 2.87 (2.76-2.98) | 3680 | 528.8 (511.2-546.3) | 2.35 (2.28-2.42) |
| Obese (≥30.0) | 431 | 1055.9 (1023.7-1088.1) | 6.10 (5.54-6.72) | 978 | 1047.6 (1015.2-1080.0) | 4.36 (4.09-4.65) |
| Waist circumference (cm) | ||||||
| Normal‡ | 3781 | 178.6 (169.7-187.5) | 1.00 (0.96-1.04) | 2914 | 116.7 (109.9-123.5) | 1.00 (0.96-1.04) |
| Abdominal obesity grade 1§ | 947 | 713.8 (663.8-763.8) | 3.06 (2.87-3.26) | 2690 | 408.2 (392.4-423.9) | 2.19 (2.11-2.27) |
| Abdominal obesity grade 2∥ | 356 | 1379.9 (1309.3-1450.6) | 5.16 (4.65-5.73) | 2728 | 843.7 (829.8-857.6) | 3.94 (3.78-4.10) |
*
Standardised to age and study area structure of China Kadoorie Biobank population
†
Stratified by age and study area and adjusted for education, income, occupation, smoking, alcohol consumption, physical activity, family history of diabetes
‡
Men: ≤94.0 cm, women: ≤80.0 cm
§
Men: 94.1-102.0 cm, women: 80.1-88.0 cm
∥
Men: >102.0 cm, women >88.0 cm. Analyses restricted to participants who developed diabetes between 35 and 70 years- excludes 7 incident diabetes cases at ages <35 years and 236 at ages ≥80 years. BMI, body mass index.