Cigarette smoking and all-cause mortality in rural Chinese male adults: 15-year follow-up of the Anqing cohort study

Table 3 The relation of smoking initiation age and pack-years with mortality in current smokers

Variables	N	Deaths (%)	Crude model	P value	Adjusted model^a	P value
Variables	N	Deaths (%)	OR (95%CI)	P value	OR (95%CI)	P value
Never	990	74 (7.5)	ref		ref
Age at smoking initiation, yrs
B1(≥20)	2203	221 (10)	1.38 (1.05,1.81)	0.020	1.39 (1.06,1.84)	0.019
B2(< 20)	1646	209 (12.7)	1.80 (1.36,2.38)	< 0.001	1.91 (1.43,2.54)	< 0.001
Pack-years(< 20)
≥ 20	697	59 (8.5)	1.14 (0.81,1.63)	0.452	1.22 (0.85,1.75)	0.279
< 20	263	23 (8.7)	1.19 (0.73,1.93)	0.491	1.26 (0.76,2.08)	0.378
Pack-years(20–40)
≥ 20	1230	130 (10.6)	1.46 (1.09,1.97)	0.012	1.50 (1.11,2.04)	0.009
< 20	918	115 (12.5)	1.77 (1.30,2.41)	< 0.001	1.98 (1.43,2.74)	< 0.001
Pack-years(≥40)
≥ 20	276	32 (11.6)	1.62 (1.05,2.51)	0.030	1.42 (0.90,2.23)	0.132
< 20	465	71 (15.3)	2.23 (1.58,3.14)	< 0.001	2.13 (1.49,3.06)	< 0.001

^aAdjusted for age, body mass index, systolic blood pressure, diastolic blood pressure, fasting glucose, total cholesterol, triglycerides, high-density lipoprotein cholesterol and alcohol drinking status, education level and occupation

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