Al‐Najashi 1996.

Methods	Randomisation and allocation concealment: no information provided Blinding of outcome assessment: unclear Documentation of exclusion: no loss to follow‐up
Participants	189 women with an uncomplicated twin pregnancy between 22‐26 weeks' gestation were recruited into the study. Women with hypertension, diabetes, cardiac disease or antepartum haemorrhage were excluded.
Interventions	Women were allocated into 2 intervention groups. Prophylactic oral ritodrine 10 mg 3 times/d starting from the 25th week until the end of the 37th week of gestation. Women in this group were not restricted in any of their activities. Hospitalisation from 28‐32 weeks' gestation Women allocated to the control group received no medication or hospitalisation for bed rest and were seen regularly in the outpatient clinic until delivery. No restriction in any of their activities All women received abdominal ultrasound for confirmation of diagnosis of booking, and 1 or 2 subsequent ultrasounds to monitor fetal growth.
Outcomes	Gestational age at delivery Birthweight Preterm birth Caesarean section rate Perinatal mortality
Notes	Study design is unclear Chorionicity: not reported Sample‐size calculation: not performed Intention‐to‐treat analyses: performed Compliance: 5 women (8%) in the ritodrine group did not take their tablets at the beginning due to side effects. 12 women (21%) in the hospitalisation group did not complete their hospital stay Location: single centre in Al‐Khobar, Saudi Arabia Timeframe: July 1986‐August 1994