Table 3.

Comparison of the Incidence of Pneumonia According to Minimum Serum Albumin Level During the First Two Postoperative Days

Outcome	Minimum Albumin During the First Two Postoperative Days (g/dL)	Crude			IPTW*		PSM*
		Event/N	OR (95% CI)	P-value	OR (95% CI)	P-value	Event/N	OR (95% CI)	P-value
Pneumonia	<3.0	45/602	3.110 (1.688, 5.732)	<0.001a	3.053 (1.958, 4.760)	<0.001b	19/223	3.111 (1.237, 7.825)	0.016c
	≥3.0	14/553					7/223

Notes: *The propensity score was calculated using a multiple logistic regression model that included all variables presented in Table 1 excluding postoperative transfusion rate, length of stay, estimated blood loss, and minimum Hb during the first postoperative week. ^ap-value by simple logistic regression. ^bp-value by weighted logistic regression. ^cp-value by conditional logistic regression

Abbreviations: IPTW, inverse probability of treatment weighting; PSM, propensity score matching