Table 4.

RRs (95% CI) for risk of impaired fasting glucose according to trajectories of secondhand smoking exposure levels, n=2079

	T2DM incidence, n	Person-years, follow-up	Age-adjusted rate	Unadjusted model	Multivariable model*	Fully adjusted model†
				RR (95% CI)	RR (95% CI)	RR (95% CI)
Trajectories of secondhand smoking exposure
Low-stable	166	5710.33	2922.91	1.00	1.00	1.00
Moderate to low	379	13 734.32	2684.10	0.98 (0.86 to 1.12)	1.23 (1.04 to 1.44)	1.25 (1.05 to 1.49)
Moderate	55	1262.62	4402.21	1.55 (1.25 to 1.91)	1.89 (1.50 to 2.40)	1.31 (1.02 to 1.69)
High to low	40	1402.04	2938.58	0.97 (0.76 to 1.24)	1.33 (1.02 to 1.73)	1.39 (1.04 to 1.85)
P for trend				0.1590	0.0002	0.0147

The bold values are statistically significant.

*Model adjusted for age, sex and family history of type 2 diabetes, alcohol drinking status, physical exercise, and body mass index, systolic blood pressure, total cholesterol level, educational levels, and household income at baseline.

†Model adjusted for multivariable model+body mass index, systolic blood pressure, and total cholesterol level at endline.

RR, risk ratio; T2DM, type 2 diabetes mellitus.