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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)

From: Waist circumference trajectories and risk of type 2 diabetes mellitus in Korean population: the Korean genome and epidemiology study (KoGES)

  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*
  1. Abbreviation: WC waist circumference, HR hazard ratio, CI confidence interval; *there was no interaction between WC trajectories and smoking status
  2. aModel 1: Adjusted for age, age square, sex and family history of type 2 diabetes mellitus at wave 4
  3. bModel 2: Adjusted for Model 2 + alcohol intake, and physical exercise at wave 4
  4. cModel 3: Adjusted for Model 3 + systolic blood pressure, and total cholesterol at wave 4