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AbstractTo identify the risks of sustaining obstetric anal sphincter injury (OASI) during childbirth.Data were analysed from 12,612 vaginal deliveries recorded at Northwick Park District General Hospital, London, from 1 January 2006 to 30 November 2009.A total of 85.6% were spontaneous deliveries and 14.2% were instrument deliveries. The majority (64.5%) sustained some form of perineal damage, 3.7% being OASI. Logistic regression analyses revealed the risk factors for OASI to be Asian ethnicitydoi:10.1515/jpm-2013-0269 pmid:24695035 fatcat:q2sv65eysfbm7bh3tbnev34kci