Table 3.

Outcomes in high-quality studies.^20,21

Outcome	Incidence/mL/severity/duration	OR or SMD	95 % CI	P	I2 (%)
	Drain (%)	No drain (%)
Morbidity	8.8	5.9	1.55	0.42–5.76	0.51	0
Presence of abdominal collection	22.0	25.0	0.03	−0.16–0.10	0.65	30
Quantity of abdominal collection	–	–	−0.38	−1.24–0.48	0.39	76
Severity of abdominal pain	–	–	2.04	1.03–3.06	<0.0001	78
Severity of shoulder tip pain	–	–	0.93	−0.98–2.85	0.34	94
Hospital stay	–	–	–0.05	−0.39–0.29	0.77	0

OR, odds ratio; SMD, standardized mean difference; CI, confidence interval.