Table 4.

Regression coefficients, standard errors, and P-values from the multiple regression analysis type of segmented regression analysis of interrupted time series for models 2(drug expenses as the dependent variable)

	coefficients	robust std. error	t	sig	95% Conf. Interval
β1	−46.42	9.23	−5.03	0.000	−65.10885	−27.73629
β2	−1073.58	197.60	−5.43	0.000	− 1473.601	− 673.5567
β3	−19.88	16.95	−1.17	0.248	−54.20093	14.44242
β0	7905.49	131.89	59.94	0.000	7638.487	8172.492