Impact of China’s zero mark-up drug policy on drug cost of NCDs’ outpatients: an interrupted time series analysis

Table 2 The parameters of the interrupted time series analysis for NCDs outpatients (outpatient volume and average drug cost as the dependent variables respectively)

Indicator		β0		β1		β2		β3
Indicator		Estimated value	P-value	Estimated value	P-value	Estimated value	P-value	Estimated value	P-value
Outpatient volume (person-month)	Diabetes	3692.00	< 0.001	13.63	0.056	226.24	0.302	−53.04	0.012
	Hypertension	3211.00	< 0.001	−6.05	0.084	151.17	0.081	−142.19	< 0.001
	Coronary heart disease	413.38	< 0.001	3.45	0.001	−22.92	0.302	−12.16	< 0.001
Average drug cost per month (RMB)	Diabetes	761.80	< 0.001	0.16	0.835	−45.51	0.029	−4.44	0.029
	Hypertension	605.09	< 0.001	0.53	0.315	−19.79	0.276	−5.87	< 0.001
	Coronary heart disease	780.21	< 0.001	2.26	0.257	−77.46	0.047	−10.23	0.036

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