Parental risk factors and anorectal malformations: systematic review and meta-analysis

Nadine Zwink, Ekkehart Jenetzky, Hermann Brenner, Nadine Zwink, Ekkehart Jenetzky, Hermann Brenner

Abstract

Background: Anorectal malformations (ARM) are rare forms of congenital uro-rectal anomalies with largely unknown causes. Besides genetic factors, prenatal exposures of the parents to nicotine, alcohol, caffeine, illicit drugs, occupational hazards, overweight/obesity and diabetes mellitus are suspected as environmental risk factors.

Methods: Relevant studies published until August 2010 were identified through systematic search in PubMed, EMBASE, ISI Web of Knowledge and the Cochrane Library databases. Furthermore, related and cross-referencing publications were reviewed. Pooled odds ratios (95% confidence intervals) were determined to quantify associations of maternal and paternal smoking, maternal alcohol consumption, underweight (body mass index [BMI] < 18.5), overweight (BMI 25-29.9), obesity (BMI ≥30) and maternal diabetes mellitus with ARM using meta-analyses.

Results: 22 studies that reported on the association between prenatal environmental risk factors and infants born with ARM were included in this review. These were conducted in the United States of America (n = 12), Spain (n = 2), Sweden (n = 2), the Netherlands (n = 2), Japan (n = 1), France (n = 1), Germany (n = 1) and Hungary (n = 1). However, only few of these studies reported on the same risk factors. Studies were heterogeneous with respect to case numbers, control types and adjustment for covariates. Consistently increased risks were observed for paternal smoking and maternal overweight, obesity and diabetes, but not for maternal smoking and alcohol consumption. In meta-analyses, pooled odds ratios (95% confidence intervals) for paternal smoking, maternal overweight, obesity, pre-gestational and gestational diabetes were 1.53 (1.04-2.26), 1.25 (1.07-1.47), 1.64 (1.35-2.00), 4.51 (2.55-7.97) and 1.81 (1.23-2.65), respectively.

Conclusion: Evidence on risk factors for ARM from epidemiological studies is still very limited. Nevertheless, the few available studies indicate paternal smoking and maternal overweight, obesity and diabetes to be associated with increased risks. Further, ideally large-scale multicentre and register-based studies are needed to clarify the role of key risk factors for the development of ARM.

Figures

Figure 1
Figure 1
Flow diagram of the literature search process.
Figure 2
Figure 2
Forest plot for maternal cigarette consumption.
Figure 3
Figure 3
Forest plot for paternal cigarette consumption.
Figure 4
Figure 4
Forest plot for maternal alcohol consumption.
Figure 5
Figure 5
Forest plot for maternal underweight (BMI < 18.5).
Figure 6
Figure 6
Forest plot for maternal overweight (BMI 25-29.9).
Figure 7
Figure 7
Forest plot for maternal obesity (BMI ≥30).
Figure 8
Figure 8
Forest plot for any maternal diabetes mellitus.
Figure 9
Figure 9
Forest plot for maternal pre-gestational diabetes.
Figure 10
Figure 10
Forest plot for maternal gestational diabetes.

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