Table 3.

Subgroup analysis.

	OR	95%CI	P value
Family poverty ratio
<1.3	1.000	0.969-1.032	0.992
1.3-3.5	0.988	0.946-1.032	0.585
≥3.5	1.065	1.006-1.127	0.030
Smoking
never	1.004	0.931-1.083	0.913
former	0.976	0.936-1.018	0.257
current	1.092	1.021-1.167	0.010

OR, odd ratio.