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

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 \( \left({\widehat{\upbeta}}_0\right) \)	Intervention \( \left({\widehat{\upbeta}}_0+\widehat{\gamma}\right) \)	Diff (BL) \( \left(\widehat{\gamma}\right) \)	Control \( \left({\widehat{\upbeta}}_0+{\widehat{\upbeta}}_1\right) \)	Intervention \( \left({\widehat{\upbeta}}_0+{\widehat{\upbeta}}_1+\widehat{\gamma}+\widehat{\updelta}\right) \)	Diff (FU) \( \left({\widehat{\gamma}}_0+\widehat{\updelta}\right) \)	DIFF-IN-DIFF \( \left(\widehat{\updelta}\right) \)
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

ISSN: 1475-9276