Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Intra-abdominal abscess in adults
Systematic review	4953 adults 40 RCTs in this analysis	Proportion of people with intra-abdominal abscess 41/2507 (2%) with laparascopic surgery 15/2446 (1%) with open surgery	OR 2.48 95% CI 1.45 to 4.21	Moderate effect size	open surgery
Systematic review	4003 people 25 RCTs in this analysis	Proportion of people with intra-abdominal abscess 56/1866 (3%) with laparoscopic surgery 34/2137 (2%) with open surgery	OR 2.29 95% CI 1.48 to 3.53 P = 0.0002	Moderate effect size	open surgery