Young 2001.

Methods	Randomised clinical trial.
Participants	Country: Australia. Number randomised: 28. Post‐randomisation drop‐outs: 0 (0%). Revised sample size: 28. Average age: 40 years. Women: 23 (82.1%). Inclusion criteria 1. ASA status I ‐ II. 2. Age < 50 years. 3. Spoke conversational English. Exclusion criteria: none.
Interventions	Participants were randomly assigned to two groups. Group 1: day‐case laparoscopic cholecystectomy (n = 14). Group 2: overnight stay laparoscopic cholecystectomy (n = 14). Day‐case participants were discharged within 8 hours. Overnight stay participants were discharged within 23 hours.
Outcomes	The outcomes reported were morbidity, failed discharge, and pain scores.
Notes	Authors replied to some questions in February 2007. We attempted to contact the authors again in September 2012.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Quote: "We used a computer generated numbers sequence" (author replies).
Allocation concealment (selection bias)	Low risk	Quote: "Patient allocation ID were placed in an envelope and put inside the Laparoscopic cholecystectomy preadmission patients packs.  It was then opened once patients had consented to participate in the study. The doctor recruiting patients was not part of the research team" (author replies).
Blinding of participants and personnel (performance bias) All outcomes	High risk	Comment: It is not possible to blind the participants for this comparison.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Comment: This information was not available.
Incomplete outcome data (attrition bias) All outcomes	Low risk	Quote: "There were no patient drop outs or withdrawals from the study" (author replies).
Selective reporting (reporting bias)	High risk	Comment: Mortality was not reported explicitly.
Vested interest bias	Unclear risk	Comment: This information was not available.