Table 4.

The association between gestational age and the risks of CNS tumors and leukemia

Gestational age	Controls	Cases	OR	95%CI		P value
				Lower	Upper
For the analysis of CNS tumor risk
< 37 weeks	54	9	1.5	0.6	3.9	0.405
37–39 weeks	331	38	1	Reference
40–41 weeks	366	20	0.3	0.2	0.6	<0.001
> 41 weeks	71	5	0.4	0.1	1.0	0.048
						P for trend = 0.001
For the analysis of Leukemia risk
< 37 weeks	54	6	0.9	0.3	2.4	0.842
37–39 weeks	331	51	1	Reference
40–41 weeks	366	52	0.7	0.5	1.2	0.175
> 41 weeks	71	15	1.2	0.6	2.3	0.659
						P for trend = 0.930

ORs and corresponding 95%CIs and p values were adjusted for sex, ethnicity, year of birth, age at diagnosis, maternal age, birth weight (5-category variable) and DOE sites