Table 3.

Results of propensity score matching. *Insufficient mortality (n=10) in this group to calculate HR

TV IBW group	Matched/treated	30-day mortality
		Unadjusted HR				Adjusted HR
		HR	95% CI		P-value	HR	95% CI		P-value
3–6	463/488	1.27	0.65	2.50	0.487	1.39	0.66	2.90	0.384
6–8	7534/8846	1.63	1.22	2.18	<0.001	1.61	1.20	2.15	0.001
8–10 (untreated)	–	–	–	–	–	–	–	–	–
10–12	4407/4412	1.00	0.60	1.67	0.995	1.11	0.65	1.91	0.694
12–20	704/720	2.34	0.61	9.06	0.217	N/A*
		LOS, relative ratio (RR)				O-E LOS >2 days
		RR	95% CI		P-value	OR	95% CI		P-value
3–6	463/488	1.04	0.98	1.10	0.153	1.20	0.84	1.72	0.320
6–8	7534/8846	1.08	1.06	1.09	<0.001	1.15	1.05	1.26	0.002
8–10 (untreated)	–	–	–	–	–	–	–	–	–
10–12	4407/4412	0.95	0.93	0.97	<0.001	0.92	0.82	1.04	0.179
12–20	704/720	0.87	0.82	0.92	<0.001	0.64	0.46	0.89	0.009