Table 5.

Results of multivariate mixed effects regression model of ICU length of stay vs. date of PVR

	Relative ICU LOS	95% CI	P
Date of PVR (per year relative to 2004)	1.03	1.0 to 1.07	0.08
Age (years) centered on 16 years	1.01	1.00 to 1.01	0.03
Race (compared to white)
Black	1.18	0.96 to 1.44	0.10
Asian	1.22	0.89 to 1.67	0.21
Other	1.01	0.84 to 1.22	0.89
Male sex (compared to female)	0.93	0.82 to 1.05	0.23
Known genetic syndrome	1.26	1.01 to 1.56	0.04
Payer (compared to private insurance)
Medicaid	1.17	1.01 to 1.36	0.03
Other	1.01	0.83 to 1.24	0.90
Trans-catheter pulmonary valve replacement	0.92	0.55 to 1.56	0.77

Abbreviations: CI confidence interval, IQR Inter-quartile range

Standardized expected ICU length of stay is 2.8 days (95% CI: 2.0 to 3.9 days). Relative ICU LOS is the relative increase in ICU duration associated with the variable of interest