Table 4.

t-Test and Sign Test for Multihospital Physicians for 1999, 2000, and 2001

		N (Physicians in Two Hospitals)			t-Test Pair Physician 1 in A and Hospital A			t-Test Pair Physician 1 in B and Hospital B			Sign Difference between Hospitals Equals Difference for the Physicians (%)
DRG	Diagnosis/Procedure	1999	2000	2001	1999	2000	2001	1999	2000	2001	1999	2000	2001
88	Chronic obstructive pulmonary disease	537	516	516	nsig	nsig	nsig	nsig	nsig	nsig	56.1	54.7	54.7
127	Congestive heart failure	877	972	1,009	nsig	nsig	nsig	nsig	nsig	nsig	55.8	57.8	57.6
209	Major joint procedures	123	135	95	sig*	nsig	nsig	nsig	nsig	nsig	68.3	67.4	68.4
358	Hysterectomy with complications	120	87	103	nsig	nsig	nsig	nsig	nsig	nsig	58.3	60.9	58.3
359	Hysterectomy without complications	100	73	71	nsig	nsig	nsig	sig*	nsig	nsig	51.0	56.2	57.7
370	Cesarean section with complications	128	130	124	nsig	nsig	nsig	nsig	nsig	nsig	67.2	62.3	62.9
371	Cesarean section without complications	104	74	74	nsig	nsig	nsig	nsig	nsig	nsig	86.5	70.3	73.0

^*p<.05.

DRG, diagnosis-related group; sig, significant; nsig, not significant.