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

Table 7 DID estimation of Blood pressure (mmHg)

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) \( \left(\widehat{\gamma}+\widehat{\updelta}\right) \)	DIFF-IN-DIFF \( \left(\widehat{\updelta}\right) \)
SBP	114.9	112.6	−2.3	114.6	109.4	−5.2	−2.9
P			0.855			0.043	0.011
DBP	197.5	197.2	0.3	203.6	196.0	−7.6	− 7.9
P			0.420			0.095	0.508

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