Association between age and body mass index with risk of incident diabetes in Chinese adults
| Age, year | Participants (n) | Events (n) | Incidence rate (per 1000 persons per year) | HRs | |
| Body mass index adjusted | Multivariable adjusted +body mass index | ||||
| 20 to <30 | 28 633 | 75 | 0.93 | Ref. | Ref. |
| 30 to <40 | 82 976 | 546 | 2.18 | 1.64 (1.29, 2.09) | 2.07 (1.24, 3.47) |
| 40 to <50 | 45 414 | 789 | 5.45 | 3.83 (3.03, 4.86) | 4.83 (2.90, 8.03) |
| 50 to <60 | 30 006 | 1224 | 12.50 | 8.39 (6.64, 10.59) | 12.26 (7.42, 20.27) |
| 60 to <70 | 17 534 | 976 | 17.61 | 11.77 (9.30, 14.89) | 15.50 (9.34, 25.70) |
| ≥70 | 7270 | 564 | 22.39 | 17.55 (13.79, 22.33) | 21.98 (13.14, 36.77) |
| P for trend | – | – | – | <0.0001 | <0.0001 |
| Crude rate | 211 833 | 4174 | 6.17 | – | – |
| Standardised rate* | 211 833 | 4174 | 7.35 | – | – |
| Body mass index, kg/m2 | Age adjusted | Multivariable adjusted | |||
| <18.5 | 12 081 | 31 | 0.82 | 0.39 (0.27, 0.56) | 0.46 (0.24, 0.90) |
| 18.5 to <24.0 | 116 812 | 1073 | 2.72 | Ref. | Ref. |
| 24.0 to <28.0 | 64 774 | 1936 | 9.44 | 2.51 (2.33, 2.70) | 2.36 (2.04, 2.73) |
| ≥28.0 | 18 166 | 1134 | 21.00 | 5.58 (5.13, 6.07) | 5.22 (4.44, 6.13) |
| P for trend | <0.0001 | <0.0001 | |||
Multivariable-adjusted model adjusted for age, sex, smoking status, drinking status, family history of diabetes.
*The incidence rate was standardised to the population of mainland China in 2010.