Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Duration of hospital stay in adults
Systematic review	2900 adults 26 RCTs in this analysis	Duration of hospital stay with laparascopic surgery with open surgery Absolute numbers not reported	WMD 1.1 days 95% CI 0.6 days to 1.5 days	Effect size not calculated	laparascopic surgery
Systematic review	2453 people 18 RCTs in this analysis	Duration of hospital stay with laparoscopic surgery with open surgery Absolute numbers not reported	Difference –0.62 days 95% CI –1.05 days to –0.18 days P = 0.006	Effect size not calculated	laparoscopic surgery
RCT	100 adults with suspected appendicitis randomised: 83 had appendicectomy	Duration of hospital stay 55.80 hours with laparoscopic surgery 75.06 hours with open surgery	P <0.05	Effect size not calculated	laparoscopic surgery
RCT	50 adults with acute appendicitis	Duration of hospital stay 2.92 days with laparoscopic surgery 5.40 days with open surgery	P <0.001	Effect size not calculated	laparoscopic surgery
RCT	52 overweight people (BMI at least 25), 86% men	Duration of hospital stay 43 hours with laparoscopic surgery 43 hours with open surgery	P = 0.88		Not significant