. Author manuscript; available in PMC: 2015 Jun 1.

Published in final edited form as: J Thorac Cardiovasc Surg. 2013 Sep 24;147(6):1791–1798.e4. doi: 10.1016/j.jtcvs.2013.07.063

Table 3B.

Final Model for Risk Factors Associated with Stage II Hospital Length of Stay Excluding 13 Subjects Not Discharged Between Norwood and Stage II Procedures. (N=331, generalized R²=0.24).

Variable	Hazard ratio (95% CI)	P	Reliability
Site		<.001	98%
Log of Norwood Length of stay in days	1.56 (1.25, 1.96)	<.001	79%
Non-elective reason for timing of stage II	1.88 (1.42, 2.50)	<.001	89%
Associated clinical diagnosis with stage II: Branch PA stenosis present	1.60 (1.22, 2.10)	<.001	81%
Pre-stage II Echo: RV fractional area change (range 0 to 1)^*	0.91 (0.85, 0.98) Per 0.05 increase	0.017	54%

28 subjects had missing RV fractional area change on pre-stage II Echo.