Table 4. Meta-regression results of variables for oropharyngeal leak pressure.

	Coefficient	95%CI		P	Residual Q
Country	0.04	–0.03	0.10	0.26	36.99
Surgery or patients’ condition	0.04	–0.11	0.19	0.62	10.18
Sample size	0.01	–0.00	0.01	0.17	10.30
Pre-anesthetic medication	0.08	–0.09	0.24	0.35	10.02
General anesthesia	–0.01	–0.15	0.12	0.86	10.34