Abstract
BackgroundResults from epidemiological studies about the association between maternal prepregnancy obesity and the risk of shoulder dystocia are inconsistent.ObjectiveTo evaluate the effect of maternal prepregnancy obesity on the risk of shoulder dystocia.Search strategyWe searched PubMed and the Web of Science database for all relevant studies up to 5 August 2016 and reviewed the reference lists of identified articles.Selection criteriaObservational studies that investigated the association between prepregnancy obesity and the risk of shoulder dystocia were included.Data collection and analysisA total of 20 articles involving 2 153 898 participants were included in this meta‐analysis. A random‐effects model was used to calculate the pooled relative risks (RRs) with 95% CIs.Main resultsFor obese versus nonobese, the pooled RR of shoulder dystocia was 1.63 (95% CI: 1.33–1.99). The findings remained significant in the cohort studies (RR = 1.57, 95% CI: 1.28–1.93) and case–control studies (RR = 2.70, 95% CI: 1.46–4.98). With regard to the subgroup ‘continents’, there was a significant association between obesity and the risk of shoulder dystocia in Europe (RR = 1.51, 95% CI: 1.18–1.92) and Asia (RR = 2.59, 95% CI: 1.15–5.83). The result from the sensitivity analysis for studies adjusted for gestational diabetes was significant (RR = 1.61, 95% CI: 1.05–2.47). The pooled RRs for obesity classes I, II and III versus nonobese were 1.29 (95% CI: 1.06–1.57), 1.94 (95% CI: 1.26–2.98) and 2.47 (95% CI: 1.56–3.93), respectively.ConclusionThis meta‐analysis suggests that maternal prepregnancy obesity is associated with an increased risk of shoulder dystocia.Tweetable abstractA meta‐analysis shows that maternal prepregnancy obesity increases the risk of shoulder dystocia.
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