Table 4.

DID results from liner regression analyses in two wards.

Variable	Coefficient	p	RSE	95%CI
				Lower bound	Upper bound
In the hepatobiliary surgery ward
Average LOS	−3.234	0.006	6.290	−5.519	−0.949
DDDs per patient	−2.352	0.047	6.154	−4.676	−0.028
DDDs per patient day	−0.061	0.365	0.318	−0.194	0.071
Antibiotic costs	−404.675	0.197	1578.000	−1020.525	211.174
Daily costs	3.854	0.733	48.498	−18.395	26.068
Hospitalization costs	−7745.818	0.005	15690.000	−13078.780	−2412.860
In the respiratory surgery ward
Average LOS	−0.874	0.383	6.989	−2.841	1.093
DDDs per patient	−3.948	0.029	13.939	−7.489	−0.407
DDDs per patient day	−0.215	0.048	0.898	−0.429	−0.002
Antibiotic costs	−935.087	0.014	2887.200	−1679.427	−190.746
Daily costs	−21.821	0.214	106.840	−56.240	12.598
Hospitalization costs	−2458.432	0.130	10954.000	−5639.068	722.204

LOS, length of hospital stay; DDDs, defined daily doses; DID, difference-in-differences. Bold values, indicating p < 0.05.