Table 2.
Age-standardized sex-specific prevalence of T1DM among those with newly diagnosed diabetes
| Age, y | Male | Female | LADA | Classic T1DM | T1DM | |||
|---|---|---|---|---|---|---|---|---|
| Male | Female | Male | Female | Male | Female | |||
| n | n | n(%) | n(%) | n(%) | n(%) | n(%) | n(%) | |
| 30–34 | 885 | 298 | 38(4.29) | 20(6.71) | 56(6.33) | 28(9.40) | 94(10.62) | 48(16.11) |
| 35–39 | 1106 | 394 | 46(4.16) | 28(7.11) | 39(3.53) | 23(5.84) | 85(7.69) | 51(12.94) |
| 40–44 | 1429 | 576 | 70(4.90) | 23(3.99) | 23(1.61) | 18(3.13) | 93(6.51) | 41(7.12) |
| 45–49 | 1607 | 955 | 57(3.55) | 46(4.82) | 32(1.99) | 15(1.57) | 89(5.54) | 61(6.39) |
| 50–54 | 1705 | 1442 | 53(3.11) | 53(3.68) | 27(1.58) | 22(1.53) | 80(4.69) | 75(5.20) |
| 55–59 | 1227 | 1076 | 31(2.53) | 41(3.81) | 20(1.63) | 14(1.30) | 51(4.16) | 55(5.11) |
| 60–64 | 1052 | 1055 | 33(3.14) | 35(3.32) | 6(0.57) | 11(1.04) | 39(3.71) | 46(4.36) |
| 65–69 | 675 | 657 | 20(2.96) | 19(2.89) | 9(1.33) | 4(0.61) | 29(4.30) | 23(3.50) |
| ≥70 | 656 | 554 | 20(3.05) | 25(4.51) | 3(0.46) | 6(1.08) | 23(3.51) | 31(5.60) |
| p for trend | 0.0020 | 0.0019 | <0.0001 | <0.0001 | <0.0001 | <0.0001 | ||
| Crude rate | 10,342 | 7007 | 368(3.56) | 290(4.14) | 215(2.08) | 141(2.01) | 583(5.64) | 431(6.15) |
| Standardized† | 3.40(2.75–4.05) | 4.20(3.47–4.93) | 1.72(1.25–2.19) | 1.96(1.45–2.47) | 5.14(4.36–5.92) | 6.16(5.30–7.02) | ||
| p for sex difference | 0.0039 | 0.0520 | 0.0004 | |||||
Notes: Data are expressed as n (%). Standardized prevalence was expressed as p (95% CI). p for trend was derived from the Mantel-Haenszel Chi-square test and p for sex difference was derived from logistic regression; †The prevalence was standardized to the patient population with newly diagnosed diabetes in China National Survey of Diabetes in 2010 and only those aged 30 years and above were included in the standardization, so the standardized prevalence was only for those aged 30 years and above.
Abbreviations: LADA, latent autoimmune diabetes in adults and including latent autoimmune diabetes in youth; T1DM, type 1 diabetes, including LADA and classic type 1 diabetes.