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

Table 3.

DID estimation on frequencies of medical services utilization

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	4.180	4.072	−0.108	4.161	7.353	3.192	3.3
P			0.115			0.041	0.008
Inpatient	0.063	0.125	0.062	0.087	0.074	−0.013	−0.075
P			0.000			0.095	0.000
Total medical services	4.243	4.197	−0.046	4.248	7.427	3.179	3.225
P			0.862			0.003	0.001