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Because of the association between SIDS and low birthweight, the means of the observed and expected birthweights of 129 siblings (66 were untraceable) were calculated. A statistically significant deficit of approximately 100 grams was found in the average observed birthweight. After allowing for length of gestation, a deficit of similar magnitude remained. As mother's age at parturition increased, the size of deficit increased. Differences between observed and expected mean birthweights of SIDS cases were in all instances larger than those observed in their siblings and tended to increase as mother's age increased.
Because of the association between SIDS and low birthweight, the means of the observed and expected birthweights of 129 siblings (66 were untraceable) were calculated. A statistically significant deficit of approximately 100 grams was found in the average observed birthweight. After allowing for length of gestation, a deficit of similar magnitude remained. As mother's age at parturition increased, the size of deficit increased. Differences between observed and expected mean birthweights of SIDS cases were in all instances larger than those observed in their siblings and tended to increase as mother's age increased.