OBJECTIVE-The objective of the study was to investigate the association between maternal self-reported infections, fever, and smoking in the prenatal period and the subsequent risk for congenital cerebral palsy (CP).STUDY DESIGN-We included the 81,066 mothers of singletons born between 1996 and 2003 who participated in the Danish National Birth Cohort. Children were followed up through December 2008. Information on maternal infections, fever, smoking, and other demographic and lifestyle factors during pregnancy were reported by mothers in computer-assisted telephone interviews in early and midgestation. We identified 139 CP cases including 121 cases of spastic CP (sCP) as confirmed by the Danish National Cerebral Palsy Register. Cox proportional hazards regression models were used to estimate adjusted hazard ratios (aHRs) and 95% confidence intervals (CIs). RESULTS-Self-reported vaginal infections were associated with an increased risk of CP and sCP (aHR, 1.52; 95% CI, 1.04-2.24; and aHR, 1.73; 95% CI, 1.16-2.60, respectively) and particularly untreated vaginal infections were associated with an increased risk of sCP (aHR, 1.95; 95% CI,. Fever was associated with the risk of CP (aHR, 1.53; 95% CI, 1.06-2.21). Smoking 10 or more cigarettes per day during pregnancy was also associated with sCP (aHR, 1.80; 95% CI, 1.10-2.94). There was a modest excess in risk for children exposed to both heavyThe views expressed herein are those of the authors are those of the authors and do not necessarily represent the official position of the Centers for Disease Control and Prevention.The authors report no conflict of interest.Reprints not available from the authors. CONCLUSION-Self-reported vaginal infections, fever, and smoking 10 or more cigarettes per day during pregnancy were associated with a higher risk of overall CP and/or sCP.
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Keywordscongenital cerebral palsy; maternal infections; pregnancy; smoking Congenital cerebral palsy (CP) constitutes a group of permanent disorders of movement and posture causing activity limitation attributed to non-progressive disturbances that occurred in the developing fetal or infant brain. 1 CP is the most common physical developmental disability in childhood with a birth prevalence of 2 per 1000 live births in Denmark. 2,3 The incidence of CP increases with lower gestational age, up to 100 cases per 1000 births in extreme preterm cases (<28 weeks). 4,5 Improvements in perinatal care and neonatal survival in recent decades have increased the survival of children born preterm and therefore the number of CP cases. 4,6 Maternal fever 7,8 and maternal infections 9-11 have been associated with an increased risk of CP, irrespective of gestational age. Infections of the vagina or urinary tract during pregnancy have been of special interest because of their proximity to the fetus, but most studies have not clearly separated these infections. Self-reported data from questionnaires administered during pregnancy provide separation of each type of infection and more importan...