Comparison 1. PLMA versus tracheal tube.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Oxygen saturation of peripheral blood (SpO2) (%)	2		Mean Difference (IV, Random, 95% CI)	Subtotals only
1.1 During surgery－before carboperitoneum	1	70	Mean Difference (IV, Random, 95% CI)	0.5 [‐0.11, 1.11]
1.2 During surgery－during carboperitoneum	1	70	Mean Difference (IV, Random, 95% CI)	0.10 [‐0.58, 0.78]
1.3 During surgery－after carboperitoneum	1	70	Mean Difference (IV, Random, 95% CI)	0.40 [‐0.54, 1.34]
1.4 in PACU	2	204	Mean Difference (IV, Random, 95% CI)	2.54 [1.09, 4.00]
1.5 After surgery－30 minutes	1	134	Mean Difference (IV, Random, 95% CI)	2.30 [1.57, 3.03]
1.6 After surgery－2 hours	1	134	Mean Difference (IV, Random, 95% CI)	1.60 [0.85, 2.35]
1.7 After surgery－24 hours	1	134	Mean Difference (IV, Random, 95% CI)	1.5 [0.91, 2.09]
2 Laryngospasm/bronchoconstriction between induction and recovery	2	232	Risk Ratio (M‐H, Random, 95% CI)	0.50 [0.09, 2.84]