Table 2.

Parental smoking and childhood central nervous system tumour.

	Cases n = 209 (%)	Controls n = 1681 (%)	ORa	95% CIb
Maternal smoking (pregnancy)
No	165 (79)	1356 (81)	1.0	reference
Yes	44 (21)	325 (19)	1.1	[0.8–1.6]
< 10cig/day	29 (9)	220 (13)	1.1	[0.7–1.6]
≥10cig/day	13 (6)	99 (6)	1.1	[0.6–2.0]
p for trend				ns
Paternal smoking (year prior to birth)
No	101 (50)	897 (55)	1.0	reference
Yes	103 (50)	746 (45)	1.2	[0.9–1.6]
< 20 cig/day	52 (25)	426 (26)	1.1	[0.8–1.6]
≥20 cig/day	51 (25)	310 (19)	1.4	[1.0–2.1]
p for trend				0.04
Parental smoking
None	87 (43)	815 (50)	1.0	reference
Mother only	14 (7)	82 (5)	1.6	[0.9–3.0]
Father only	74 (36)	516 (31)	1.3	[1.0–1.9]
Both parents	29 (14)	230 (14)	1.2	[0.7–1.8]

^aOR: Odds Ratios adjusted for age and gender,

^b95% Cl: 95% Confidence Interval