TABLE 2.

Day care attendance and risk of neuroblastoma (year before diagnosis excluded)

	Cases		Controls		OR*	95% CI†
	N°	%	N°	%
Day care attendance
No	340	78	269	72	1.00	reference
Yes	97	22	103	28	0.81	0.56–1.17
Age at starting day care
No day care	340	78	269	72	1.00	reference
< 6 months	55	13	52	14	0.90	0.57–1.41
≥ 6 months	36	8	42	12	0.72	0.43–1.22
Day care duration
No day care	340	78	269	72	1.00	reference
< 6 months	9	2	7	2	1.01	0.36–2.83
≥ 6 months	88	20	99	26	0.75	0.52–1.10
Total hours day care exposure‡
No day-care	340	78	269	72	1.00	reference
< 500 hours	15	3	12	3	0.99	0.44–2.22
≥ 500 hours	82	19	94	25	0.74	0.51–1.09

^*Unmatched odds ratios (OR) adjusted for child’s diagnosis reference age, mother’s race, mother’s education and household income at birth year.

^†CI: confidence interval.

^‡Total hours day care exposure took into account both day-care duration and number of day care hours attended per week.