UK case control study of brain tumours in children, teenagers and young adults: a pilot study

BMC Research Notes

Table 2 Results of the Logistic Regression modelling according to selected risk factors

	Cases		Controls		Odds ratio*	95% confidence interval
	n	%	n	%
Ever breastfed?
No	12	24.5	13	16.7	REF
Yes	32	65.3	62	79.5	0.4	0.2	1.2
Missing	5	10.2	3	3.9
Caesarean section?
No	33	67.4	63	80.8	REF
Yes	11	22.5	11	14.1	1.6	0.6	4.4
Missing	5	10.2	4	5.1
Birthweight (g)
<2500	2	4.1	3	3.9	1.5	0.2	11.9
2500-2999	4	8.2	12	15.4	1.0	0.2	4.0
3000-3499	11	22.5	30	38.5	REF
3500-3999	16	32.7	16	20.5	2.9	1.0	8.2
4000+	11	22.5	9	11.5	3.7	1.1	12.4
Missing	5	10.2	8	10.3
Number of siblings
0	5	10.2	8	10.3	REF
1	20	40.8	37	47.4	1.1	0.3	4.3
2	9	18.4	21	26.9	1.0	0.2	4.3
3+	15	30.6	9	11.5	3.0	0.7	13.6
Missing	0	0.0	3	3.9
Spoken on a mobile phone more than 20 times?
No	23	46.9	28	35.9	REF
Yes	26	53.1	49	62.8	0.9	0.2	3.3
Missing	0	0.0	1	1.3
Any animals kept at home?
No	11	22.5	14	17.9	REF
Yes	38	77.5	62	79.5	1.0	0.3	2.9
Missing	0	0.0	2	2.6
Regular contact with animals outside the home?
No	35	71.4	47	60.3	REF
Yes	14	28.6	31	39.7	0.7	0.3	1.5
Missing	0	0.0	0	0.0

*Odds ratios calculated using conditional logistic regression stratified by age (5-year groups) and sex, analyses were adjusted for deprivation by the use of Townsend score quintiles based on the UK population distribution.
REF, Reference category.

ISSN: 1756-0500