Results
A total of 970 women were randomised; two women in the CTG+STan arm withdrew after randomisation, and one in this arm was mistakenly randomised before consent was obtained. Thus 967 women, 482 randomised to CTG+STan and 485 women randomised to CTG alone were included in the trial. Costs were calculated for 956 of these women (98.9%); the final 6 women in the STan arm and the final 5 women in the CTG alone arm were not included as their costing data was not available at the time of analysis. The two arms were similar in baseline characteristics with mean maternal age of 31 years, mean maternal gestation at randomisation of 39 weeks and cervical dilation at randomisation of 3 cm (Supplementary Table 1).