TABLE 1.

Study Population Characteristics by Age Category

Characteristic	Totala		Age Categorya				P
			0–3 Months (n = 5677)		4 Months to 364 Days (n = 2530)
	n	%	n	%	n	%
Gender							.24
Male	4780	58.2	3273	57.7	1507	59.6
Female	3408	41.5	2390	42.1	1018	40.2
Unknown	19	0.2	13	0.2	5	0.2
Race/ethnicity							.02
Hispanic	1595	19.4	1078	19.0	517	20.5
Non-Hispanic white	3688	44.9	2537	44.7	1151	45.5
Non-Hispanic black	2471	30.1	1762	31.0	708	28.0
Other race	453	5.5	300	5.3	154	6.1
Any CCC	102	1.2	46	0.8	56	2.2	<.001
Primary caregiver							.17
Parent	7795	95.0	5404	95.2	2391	94.5
Foster parent	87	1.1	61	1.1	27	1.1
Parent’s partner	70	0.9	46	0.8	24	0.9
Relative or friend	135	1.6	80	1.4	55	2.2
Other	40	0.5	26	0.5	14	0.6
Unknown	80	1.0	60	1.1	20	0.8
Autopsy performed							.29
Yes	8008	97.6	5544	97.7	2464	97.4
No	89	1.1	54	1.0	35	1.4
Unknown	109	1.3	79	1.4	31	1.2
Diagnosis							.02
SIDS/SUID	2873	35.0	1969	34.7	904	35.7
Accidental suffocation and strangulation in bed	2196	26.8	1482	26.1	714	28.2
Unknown/undetermined	3138	38.2	2226	39.2	912	36.0

SUID, sudden unexpected infant death.

^aFrequencies are nonintegers due to averaging over 5 independent imputations during the multiple imputation process; frequencies shown are rounded to the nearest integer.