. 2017 Aug 15;44(5):413–419. doi: 10.1097/WON.0000000000000358

TABLE 2. Results of Longitudinal Data Analysis of Pressure Injury Rates (AHRQ Patient Safety Indicator #3) Associated With Adoption of Prophylactic Foam Sacral Dressings Between Hospital-Quarters^a.

Variable	Model 1		Model 2		Model 3
Variable	Coefficient	SE	Coefficient	SE	Coefficient	SE
Units of dressings acquired	−3.79E-05^b	1.80E-05			−2.77E-05	9.90E-06
Cost of dressings acquired, $			−5.92E-06	2.24E-06	1.77E-04	7.61E-05
Case-mix index	0.331	0.224	0.340	0.225	0.315	0.232
Intercept	−8.349	0.567	−8.358	0.570	−8.349	0.590
Variance (intercept)	0.457	0.153	0.467	0.155	0.535	0.175
Log-likelihood	−739.021		−737.674		−735.126

Abbreviation: SE, standard error.

^aCoefficients for time and CMS policy were insignificant, thus removed from the final model.

^bItalicized values are significant (P < .05).

TABLE 2. Results of Longitudinal Data Analysis of Pressure Injury Rates (AHRQ Patient Safety Indicator #3) Associated With Adoption of Prophylactic Foam Sacral Dressings Between Hospital-Quartersa.