TABLE 1

Study Characteristics

Source	Study Area	Period	SIDS Defined	Swaddling Defined	Control Group Selection
Ponsonby et al¹⁶^,²¹	Tasmania, Australia	1988–1991	After postmortem by hospital pathologist, including toxicologic and bacteriologic screenings	Infant wrapped in an item of bedding (eg, sheet or light blanket) while asleep	96% aged within 7 d of each case subject, 100% within 14 d
Fleming et al¹⁸^,²²^–²⁴	England, UK	1993–1996	Using the Avon Clinico-Pathological Classification System and 1989 definition of SIDS²⁵	Infant wrapped in an item of bedding (eg, sheet or light blanket) while asleep	65.8% aged within 14 d of each case subject, 91.2% within 1 mo
Hauck et al¹⁷^,²⁶	Chicago, Illinois, USA	1993–1996	1989 definition of SIDS²⁵	Wrapped/swaddled	88% aged within 14 d of each case subject, 100% within 1 mo; matched on maternal race and birth weight
Blair et al¹⁵	Southwest England, UK	2003–2006	Using the Avon Clinico-Pathological Classification System and 1989 definition of SIDS²⁵	Infant wrapped in an item of bedding (eg, sheet or light blanket) while asleep	Weighted distribution to mimic age distribution of earlier case–control SIDS case subjects, adjusted to the age distribution of SIDS in the present study sample