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

Table 6.

DID estimation on patient per capita annual out-of-pocket 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) $(\hat{γ} + \hat{δ})$	DIFF-IN-DIFF $(\hat{δ})$
Outpatient	235.9	221.8	−14.1	229.1	205.9	−23.2	−9.1
P			0.452			0.395	0.518
Inpatient	433.6	525.4	91.8	435.4	334.4	− 101	−192.8
P			0.049			0.043	0.027
Total	669.5	747.2	77.7	664.5	540.3	− 124.2	−201.9
P			0.085			0.041	0.022