TABLE 3.

Surface Sharing Characteristics Among Surface Sharing Sudden Expected Infant Deaths by Plurality, SUID Case Registry, 2011 to 2020

	Multiple		Singleton		p a
	n	%	n	%
Overall	365	8.2	4113	91.8
Sharing withb					<.001
Adults only	87	23.8	2961	72.0
Children only	126	34.5	209	5.1
Adults and children	140	38.4	828	20.1
Some combination of adults, children, and petsc	—	—	40	1.0
Found sleep location					<.001
Crib, bassinet, or portable crib	81	22.2	13	<1
Adult bed	223	61.1	3166	77.0
Chair or couch	36	9.9	670	16.3
Otherd	23	6.3	257	6.2
Unknown	—	—	7	<1
Found position					.001
Supine	128	35.1	1720	41.8
Prone	142	38.9	1215	29.5
Side	49	13.4	675	16.4
Unknown	43	11.8	454	11.0
Soft bedding in sleep environmente					.02
Yes	264	72.3	2804	68.2
Not specified	101	27.7	1309	31.8
Number of unsafe sleep factorsf					<.001
1	71	19.5	729	17.7
2	192	52.6	2067	50.3
3	94	25.8	1308	31.8
Could not be determined	8	2.2	9	<1

Cell counts between 0 and 6 are suppressed to maintain confidentiality.

One percent of total cases have missing or unknown information for plurality and were removed from this table.

Missing was <3% for all variables.

A missing response indicates the question was skipped during data entry. An unknown response indicates the question was considered however the information necessary to answer the question was not available to anyone.¹⁹

^aMissing data were excluded from the χ-square analysis.

^bAdults include infants who were sharing with 1 or more adults; children include infants who were sharing with 1 or more other children.

^c≤6 infants were surface sharing with just a pet.

^dIncludes floor, car seat.

^eExcludes noncrib mattress; excludes cushion when incident sleep place is couch; these variables were only indicated as affirmative in the data as a result, it is not possible to discern between missing, unknown, and no.

^fFactors include soft bedding; not in a crib, bassinet, or portable crib; and prone or side position. Zero unsafe sleep factors could not be determined because the soft bedding variable does not distinguish between missing, unknown, and no.