Table 5.

Univariable and multivariable analysis for pneumonia in all patients

	Univariable			Multivariable
	RR	95%CI	p-value	RR	95%CI	p-value
LPD vs. OPD	0.079	0.021–0.294	< 0.001	0.072	0.016–0.326	0.001
Gender	2.000	0.757–5.287	0.162
Age	0.993	0.943–1.045	0.780
Weight	1.014	0.973–1.056	0.511
Operation time	0.823	0.670–1.011	0.063	4.933	0.108–225.779	0.413
Duration of anesthesia	0.815	0.664–1.001	0.051	0.215	0.005–9.952	0.432
Intraoperative hemorrhage	1.001	0.998–1.003	0.677
ASA grade	0.376	0.117–1.209	0.101
Stage	0.520	0.123–2.201	0.375

RR relative risk, CI confidence interval