Table 4.

Odds ratio for depression according to age of starting smoking among current smokers

	Age of starting smoking
	< 19 years (n = 1,281)	20 - 24 years (n = 2,014)	≧ 25 years (n = 789)
Men	(n = 1,259)	(n = 1,980)	(n = 618)
Unadjusted	1.00 (Reference)	0.79 (0.51-1.22)	1.51 (0.84-2.71)
Multivariate- adjusted*	1.00 (Reference)	0.81 (0.52-1.27)	1.15 (0.61-2.17)
Women	(n = 22)	(n = 34)	(n = 171)
Unadjusted	1.00 (Reference)	1.37 (0.24-7.82)	0.97 (0.21-4.45)
Multivariate- adjusted*	1.00 (Reference)	2.18 (0.37-12.69)	0.95 (0.22-3.93)

Data are presented as mean (standard error) or odds ratio (95% confidence interval).

*Adjusted for age, income status, education status, marital status, job status, amount of smoking, drinking status, BMI, physical activity, Hypertension, Diabetes mellitus, and Cerebrovascular disease.