TABLE 1

Study Characteristics

SourceStudy AreaPeriodSIDS DefinedSwaddling DefinedControl Group Selection
Ponsonby et al16,21Tasmania, Australia1988–1991After postmortem by hospital pathologist, including toxicologic and bacteriologic screeningsInfant wrapped in an item of bedding (eg, sheet or light blanket) while asleep96% aged within 7 d of each case subject, 100% within 14 d
Fleming et al18,2224England, UK1993–1996Using the Avon Clinico-Pathological Classification System and 1989 definition of SIDS25Infant wrapped in an item of bedding (eg, sheet or light blanket) while asleep65.8% aged within 14 d of each case subject, 91.2% within 1 mo
Hauck et al17,26Chicago, Illinois, USA1993–19961989 definition of SIDS25Wrapped/swaddled88% aged within 14 d of each case subject, 100% within 1 mo; matched on maternal race and birth weight
Blair et al15Southwest England, UK2003–2006Using the Avon Clinico-Pathological Classification System and 1989 definition of SIDS25Infant wrapped in an item of bedding (eg, sheet or light blanket) while asleepWeighted distribution to mimic age distribution of earlier case–control SIDS case subjects, adjusted to the age distribution of SIDS in the present study sample