. 2018 Jun 25;17:89. doi: 10.1186/s12939-018-0799-8

Table 4.

DID estimation on per capita annual medical expenditure

Outcome variable (y)	Baseline (1673 vs. 1673)			Follow-up (1673 vs. 1673)
Outcome variable (y)	Control $({\hat{β}}_{0})$	Intervention $({\hat{β}}_{0} + \hat{γ})$	Diff (BL) $(\hat{γ})$	Control $({\hat{β}}_{0} + {\hat{β}}_{1})$	Intervention $({\hat{β}}_{0} + {\hat{β}}_{1} + \hat{γ} + \hat{δ})$	Diff (FU) $({\hat{γ}}_{0} + \hat{δ})$	DIFF-IN-DIFF $(\hat{δ})$
Outpatient	269.2	255.4	−13.8	263.8	331.2	67.4	81.2
P			0.452			0.095	0.048
Inpatient	818.1	1167.6	349.5	910.9	785.0	−125.9	−475.4
P			0.009			0.003	0.027
Total	1087.3	1423.0	335.7	1174.7	1116.2	−58.5	−394.2
P			0.015			0.043	0.013