Table 4.
Hazard ratio with 95% confidence interval for risk of type 2 diabetes according to waist circumference trajectory group by smoking status (N = 4, 992)
| Non-smoker (N = 3209) | Ever smoker (N = 1730) | |||||
|---|---|---|---|---|---|---|
| Model1a | Model2b | Model3c | Model1a | Model2b | Model3c | |
| HR (95% CI) | HR (95% CI) | HR (95% CI) | HR (95% CI) | HR (95% CI) | HR (95% CI) | |
| WC Group A | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 | 1.0 |
| WC Group B | 3.0 (1.3–7.2) | 3.0 (1.3–7.2) | 2.7 (1.1–6.5) | 1.4 (0.5–4.6) | 1.4 (0.4–4.6) | 1.3 (0.4–4.3) |
| WC Group C | 3.0 (1.2–7.2) | 3.0 (1.3–7.3) | 2.5 (1.0–6.0) | 2.2 (0.7–6.6) | 2.2 (0.7–6.6) | 1.9 (0.6–5.9) |
| WC Group D | 7.9 (3.4–18.7) | 8.2 (3.5–19.4) | 6.2 (2.6–14.7) | 4.4 (1.5–13.3) | 4.4 (1.5–13.1) | 3.7 (1.2–11.1) |
| WC Group E | 8.4 (3.3–18.7) | 8.8 (3.5–22.3) | 6.5 (2.5–16.7) | 10.7 (3.3–34.3) | 10.5 (1.5–33.8) | 8.2 (2.5–26.9) |
| P for trend | <.0001 | <.0001 | <.0001 | 0.0003 | <.0001 | <.0001 |
| P for interaction | 0.2280* | |||||
Abbreviation: WC waist circumference, HR hazard ratio, CI confidence interval; *there was no interaction between WC trajectories and smoking status
aModel 1: Adjusted for age, age square, sex and family history of type 2 diabetes mellitus at wave 4
bModel 2: Adjusted for Model 2 + alcohol intake, and physical exercise at wave 4
cModel 3: Adjusted for Model 3 + systolic blood pressure, and total cholesterol at wave 4