Kovavisarach 1998.

Methods	Residents randomised to one of two groups using sealed envelopes. Details of method of randomisation not given. Perforations tested by filling glove with 1.5‐2 times its normal capacity and immersing in water. Air bubbles indicated perforation
Participants	Residents. Obstetric surgery ‐ perineorrhaphy. 742 single gloves and 658 double outer gloves were collected.
Interventions	Single versus standard double gloves
Outcomes	Number of perforations.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Low risk	A ‐ Adequate