Improving the performance of social health insurance system through increasing outpatient expenditure reimbursement ratio: a quasi-experimental evaluation study from rural China

Table 5 DID estimation on the SHI per capita annual reimbursement expenditure

Outcome variable (y)	Baseline (1673 vs. 1673)			Follow-up (1673 vs. 1673)
Outcome variable (y)	Control \( \left({\widehat{\upbeta}}_0\right) \)	Intervention \( \left({\widehat{\upbeta}}_0+\widehat{\gamma}\right) \)	Diff (B)\( \left(\widehat{\gamma}\right) \)	Control \( \left({\widehat{\upbeta}}_0+{\widehat{\upbeta}}_1\right) \)	Intervention \( \left({\widehat{\upbeta}}_0+{\widehat{\upbeta}}_1+\widehat{\gamma}+\widehat{\updelta}\right) \)	Diff (FU) \( \left(\widehat{\gamma}+\widehat{\updelta}\right) \)	DIFF-IN-DIFF \( \left(\widehat{\updelta}\right) \)
Outpatient	33.3	33.6	0.3	34.7	125.3	90.6	90.3
P			0.951			0.031	0.018
Inpatient	384.5	642.2	257.7	475.5	450.6	−24.9	−282.6
P			0.029			0.830	0.016
Total	417.8	675.8	258.0	510.2	575.9	65.7	−192.3
P			0.005			0.048	0.010

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