Comparison 13.

Postoperative pneumonia

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 All studies	4	252	Risk Ratio (M‐H, Fixed, 95% CI)	0.34 [0.15, 0.79]
1.1 Parenteral nutrition	1	124	Risk Ratio (M‐H, Fixed, 95% CI)	0.31 [0.12, 0.81]
1.2 Enteral nutrition	1	60	Risk Ratio (M‐H, Fixed, 95% CI)	0.38 [0.02, 8.95]
1.3 Supplements	2	68	Risk Ratio (M‐H, Fixed, 95% CI)	0.55 [0.05, 5.61]
2 HCC	2	168	Risk Ratio (M‐H, Fixed, 95% CI)	0.34 [0.14, 0.81]
2.1 Parenteral nutrition	1	124	Risk Ratio (M‐H, Fixed, 95% CI)	0.31 [0.12, 0.81]
2.2 Enteral nutrition	0	0	Risk Ratio (M‐H, Fixed, 95% CI)	0.0 [0.0, 0.0]
2.3 Supplements	1	44	Risk Ratio (M‐H, Fixed, 95% CI)	0.55 [0.05, 5.61]