Table 2 Association of vitamin use and infant leukaemia

	Controls	Combined cases			ALL			AML
	N	N	OR ^a	95% CI	N	OR ^a	95% CI	N	OR ^a	95% CI
Prenatal vitamins
Any prenatal vitamin consumption
No	19	40	1.00		28	1.00		11	1.00
Yes	303	402	0.79	0.44–1.42	235	0.63	0.34–1.18	161	1.20	0.53–2.75
Periconceptional consumption
No	100	162	1.00		104	1.00		56	1.00
Yes	222	280	0.89	0.64–1.24	159	0.77	0.54–1.11	116	1.05	0.68–1.61
Consumption during pregnancy, after confirmation of pregnancy
No	29	58	1.00		39	1.00		18	1.00
Yes	293	384	0.78	0.48–1.28	224	0.66	0.39–1.11	154	1.05	0.55–2.04
Consumption in year before and throughout pregnancy
No	137	222	1.00		137	1.00		83	1.00
Yes	185	220	0.84	0.62–1.14	126	0.77	0.55–1.09	89	0.88	0.60–1.31
Prenatal iron supplements
Any prenatal iron consumption
No	253	334	1.00		195	1.00		136	1.00
Yes	70	108	1.07	0.75–1.52	68	1.22	0.82–1.80	36	0.82	0.51–1.33
Periconceptional consumption
No	308	414	1.00		247	1.00		160	1.00
Yes	15	28	1.23	0.63–2.38	16	1.30	0.62–2.72	12	1.26	0.55–2.88
Consumption during pregnancy, after confirmation of pregnancy
No	260	345	1.00		201	1.00		141	1.00
Yes	63	97	1.06	0.74–1.53	62	1.22	0.81–1.84	31	0.77	0.46–1.27
Consumption in year before and throughout pregnancy
No	320	431	1.00		256	1.00		168	1.00
Yes	3	11	2.54	0.69–9.39	7	3.04	0.77–12.03	4	1.72	0.33–9.06

Abbreviations: 95% CI=95% confidence interval; ALL=acute lymphoblastic leukaemia; AML=acute myeloid leukaemia; OR=odds ratio.
^aORs adjusted for maternal race and household income.

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