Table 2.

ITSA results of the average medical insurance payment cost per patient.

Variables	Coefficient	SE	t	p value	95% CI	DW
Entire population
β1: baseline slope	−83.11	12.19	−6.82	<0.001	(−108.45, −57.76)	1.53
β2: level change after policy	891.65	117.06	7.62	<0.001	(648.21, 1135.08)
β3: slope change after policy	38.98	13.8	2.83	0.01	(10.29, 67.78)
β0: baseline level	3826.13	60.46	63.28	<0.001	(3700.39, 3951.87)
Resident
β1: baseline slope	−102.359	18.4154	−5.56	<0.001	(−140.66, −64.06)	1.66
β2: level change after policy	1018.9	171.188	5.95	<0.001	(662.90, 1374.91)
β3: slope change after policy	44.801	20.4327	2.19	0.04	(2.31, 87.29)
β0: baseline level	3974.607	84.749	46.9	<0.001	(3798.36, 4150.85)
Employee
β1: baseline slope	−50.63	21.04	−2.41	0.03	(−94.39, −6.88)	1.69
β2: level change after policy	679.56	98.94	6.87	<0.001	(473.80, 885.32)
β3: slope change after policy	28.52	21.93	1.30	0.21	(−17.10, 74.13)
β0: baseline level	3577.61	181.4	19.72	<0.001	(3200.37, 3954.85)