Table 7.

Propensity score matching.

Variable	Sample	Treated (T=1)	Control (T=0)	Difference	SE	T-stat
PIK	Unmatched	74.77	61.80	12.98	1.04	12.51
	ATT	74.83	63.16	11.67	1.13	10.33
UPI	Unmatched	63.76	51.67	12.09	1.03	11.73
	ATT	63.79	51.87	11.92	1.14	10.49
CDI	Unmatched	58.44	43.13	15.32	1.28	11.95
	ATT	58.49	43.98	14.51	1.42	10.20

ATT: average treatment effect on the treated; PIK: performance information knowledge; UPI: use of performance information; CDI: clinical directors’ involvement.