Comparison of Clinical Safety and Outcomes of Early versus Delayed Laparoscopic Cholecystectomy for Acute Cholecystitis: A Meta-Analysis

Table 2

Risks of bias in included studies.

Studies	Randomization sequence generation	Allocation concealment	Blinding	Incomplete outcome data	Selective reporting	Free from baseline; imbalance
Gutt et al. [7]	+	+	−	+	+	+
Yadav et al. [8]	?	?	−	?	−	+
Kolla et al. [9]	+	+	−	+	+	+
Johansson et al. [10]	+	+	−	+	+	+
Davila et al. [11]	?	?	−	?	+	?
Lai et al. [12]	+	+	−	+	+	+
Lo et al. [13]	+	+	−	+	+	+

+: low risk of bias; −: high risk of bias; ?: unclear.