Table 4.

Cox proportional hazards models on initial time of adoption of TZD Unit:(month)

	580 hospitals (total) initial time to adoption of TZD (month)				327 hospitals (adopters only) initial time to adoption of TZD (month)
	HR1	95% CI	p-value		HR1	95% CI	p-value
HHI in February, 2001 (unit: HHI*100)	0.02	(0.01 0.04)	0.0000	***	0.07	(0.03 0.18)	0.0000	***
Accreditation level
ref: Medical Center
Regional Hospital	0.75	(0.43 1.32)	0.3000		1.01	(0.56 1.81)	0.9700
District Hospital	0.43	(0.24-0.75)	0.0024	**	0.53	(0.3 0.94)	0.0260	*
BNHI Regions
Ref: Taipei
Northern	0.6	(0.41 0.89)	0.0090	*	0.65	(0.44 0.96)	0.0280	*
Central	0.88	(0.63 1.23)	0.4500		0.82	(0.58 1.14)	0.2300
Southern	0.75	(0.52 1.09)	0.1200		0.83	(0.57 1.21)	0.3300
Kao-Ping	0.58	(0.41 0.82)	0.0015	**	0.98	(0.69 1.4)	0.9200
Eastern	0.69	(0.37 1.27)	0.2300		0.7	(0.37 1.32)	0.2600
Ownership
ref: Public Hospital
Non-profit Hospital	1.79	(1.23 2.61)	0.0019	**	1.87	(1.26 2.78)	0.0015	**
Private Hospital	1.35	(0.94 1.94)	0.0950		2.14	(1.49 3.06)	0.0000	***

¹: hazard ratio; HR < 1 means the factor inhibited adoption and an HR > 1 means the factor accelerated adoption

***: p < 0.0005 **: p < 0.005 *:p < 0.05