Table 4

Paternal smoking

Paternal smoking^a	Case			Control			OR^b	95% CI
Paternal smoking^a		n	%	n	%		OR^b	95% CI
Lifetime
Never	209	53.6	212	54.5	1.0
Ever	181	46.4	177	45.5	1.0	0.7–1.3
Around pregnancy^c
Never	248	63.6	253	65.5	1.0
Ever	142	36.4	133	34.5	1.0	0.7–1.4
1 mo before conception
Never	253	64.9	267	68.6	1.0
Ever	137	35.1	122	31.4	1.2	0.8–1.6
1st trimester
Never	260	66.7	269	69.2	1.0
Ever	130	33.3	120	30.9	1.1	0.8–1.5
Cigs^d/day 1 mo before conception
0	253	65.5	267	69.2	1.0
≤5	15	3.9	13	3.4	1.3	0.6–2.8
5–10	24	6.2	24	6.2	1.0	0.5–1.9
10–20	60	15.5	58	15.0	1.1	0.7–1.7
>20	34	8.8	24	6.2	1.5	0.8–2.7
Cigs/day during 1st trimester
0	260	67.4	269	70.1
≤5	14	3.6	12	3.1	1.3	0.5–3.0
5–10	20	5.2	22	5.7	0.9	0.5–1.8
10–20	61	15.8	57	14.8	1.1	0.7–1.7
>20	31	8.0	24	6.3	1.3	0.7–2.3
Smokeless tobacco 1 mo before conception
Never	348	93.1	365	94.1
Ever	26	7.0	23	5.9	1.3	0.7–2.6

^a A total of one control had missing information on tobacco use history. Includes direct and proxy data.
^b Adjusted for child’s gender, mother’s race, father’s education, and household income in birth year.
^c Included 1 month before and during the pregnancy.
^d Cigs, cigarettes.