Table 3.

Changes in PSIs^* after Converting to CAHs for Iowa Rural Hospitals, 1997–2004

	PSI-2	PSI-3	PSI-5	PSI-6	PSI-7	PSI-15	Composite Score of Four PSIs	Composite Score of Six PSIs
N	59	57	66	66	66	66	66	54
Mean value of change in PSI (after–before)	0.187	−0.005	0.030	−0.090	−0.250	−0.800	−0.623	−0.310
Number of hospitals having better performance in PSIs after conversion (reducing PSI value)	15	32	8	18	29	37	41	30
Number of hospitals having worse performance in PSIs after conversion (increasing PSI value)	11	22	5	8	8	16	16	24
p-value for Wilcoxon signed-rank test	.68	.60	.64	.34	.01	<.01	<.01	.41

^*Lower PSI value is better performance.

PSI, patient safety indicators.