Avery 1999a.

Methods	Principal surgeon randomised to one of two groups by tossing a coin. The assistant was then assigned to the other group. Perforation test by inflating with water.
Participants	Principal surgeon and assistant. Maxillofacial surgery. 242 outer double gloves and 289 outer indicator gloves were collected.
Interventions	Double versus perforation indicator system
Outcomes	Number of perforations. Proportion of total number of perforations detected during surgery by the glove wearer..
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	High risk	C ‐ Inadequate