Table 3. Association between PPD and the number of days per week of cigarette smoke exposure at home during pregnancy and being an ex-smoker (N=354).

Variable	Postpartum depression (PPD)		χ2	P-value
	Yes  No. (%)	No  No. (%)
Were you a passive smoker during your pregnancy? (you inhale cigarette smoke from smokers around you)
No	121 (78.1)	139 (69.8)	3.01	0.082
Yes	34 (21.9)	60 (30.2)
During your pregnancy, how many days in a week did you smell cigarette smoke at home?
0 days in a week	119 (76.8)	139 (69.8)	2.13	0.343
1-4 days in a week	21 (13.5)	36 (18.1)
5-7 days in a week	15 (9.7)	24 (12.1)
Are you an ex-smoker?
No	146 (94.2)	187 (94)	0.008	0.93
Yes	9 (5.8)	12 (6)
If you were a smoker, when did you stop smoking in your last pregnancy? (before how many weeks /months/years) (No.:21)
Quit before pregnancy	3 (1.9)	7 (3.5)	4.24	0.374
Quit at 1st 3 months	6 (3.9)	3 (1.5)
Quit at 2nd 3 months	0 (0.0)	1 (0.5)
Quit at last 3 months	0 (0.0)	1 (0.5)