Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Hospital admission/readmission rates
RCT	40 women admitted to hospital at <16 weeks' gestation In review	Readmission to hospital 0/17 (0%) with oral methylprednisolone 5/18 (28%) with promethazine	OR 0.11 95% CI 0.02 to 0.71	Large effect size	methylprednisolone