Influence of Chinese National Centralized Drug Procurement on the price of policy-related drugs: an interrupted time series analysis

Table 4 ITS results of Fisher Price Index for centralized purchased drugs and alternative drugs

Item	Coef.	S.E	t	p-value	95% CI		DW
Item	Coef.	S.E	t	p-value	Lower	Lower	DW
“4 + 7” List drugs
Baseline level, β₀	0.498	0.015	33.670	0.000	0.466	0.530	1.991
Baseline trend, β₁	−0.005	0.004	−1.470	0.164	−0.013	0.002
Level change, β₂	−0.347	0.022	−15.480	0.000	−0.395	−0.299
Trend change, β₃	−0.001	0.004	−0.310	0.761	−0.011	0.008
Alternatives
Baseline level, β₀	0.494	0.004	115.580	0.000	0.485	0.503	2.223
Baseline trend, β₁	−0.001	0.001	−1.270	0.225	−0.004	0.001
Level change, β₂	0.004	0.007	0.630	0.537	−0.010	0.018
Trend change, β₃	−0.003	0.001	−2.790	0.014	−0.006	−0.001
Overall
Baseline level, β₀	0.495	0.011	44.240	0.000	0.471	0.519	2.106
Baseline trend, β₁	−0.003	0.003	−1.070	0.303	−0.009	0.003
Level change, β₂	−0.261	0.017	−15.020	0.000	−0.298	−0.223
Trend change, β₃	−0.004	0.003	−1.150	0.268	−0.011	0.003

Coef. coefficient, S.E standard error, CI confidence interval, DW Durbin-Watson statistic

ISSN: 1471-2458