Objective - To study the distribution of prenatal and postnatal risk factors for sudden infant death syndrome (SIDS). Design - A questionnaire-based survey for SIDS risk factors; family interviews were performed among the parents of SIDS victims and symptom-free infants. Setting - The survey was conducted in paediatric primary health care units in Budapest, Hungary in the period 1996 to 1998. Subject - Eighteen SIDS cases and 74 symptom-free healthy infants aged 7-365 days were investigated. Main outcome measures - Occurrence of risk factors and impact of social environment were analysed using conditional logistic regression. Results - In this study, the classic risk factors of small birth weight, maternal smoking, bottle-feeding did not reflect differences between the investigated groups. The prone position did not demonstrate a difference between SIDS cases and controls (p =0.86). Short intervals between pregnancies (OR =4.8, CI =1.2?19.9, p =0.025) and social disadvantage (OR =6.7, CI =1.3?35.7, p =0.015) indicated significant differences between SIDS cases and controls. Conclusion ? The outcome of our survey shows that infants from a lower social and economic environment may be at higher risk for SIDS.
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