This is a fully labelled SPSS dataset from the clinical trial of umbilical oxytocin for the treatment of human retained placentas. Ethical approval for its publication was obtained from the Central NRES Committee (London) on 24th March 2015. All except 2 indirect identifiers have been removed so as to fully anonymise it in line with recommendations from Hrynaszkiewicz et al (BMJ 2010;340:c181)