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. 2021 Oct 18;21:1113. doi: 10.1186/s12913-021-07052-5

Table 4.

ICOC elasticity for sub-samples

ICOC elasticity
OP costs IP costs Total
costs
OLS model Clinics only (n = 9,437)

-0.33

(0.007)

 *

-1.49

(0.04)

 **

-0.52

(0.01)

 **
Hospitals only (n = 16,975)

-0.03

(0.006)

 *

-1.68

(0.04)

 *

-0.24

(0.007)

 *
2SLS model Clinics only

1.03

(0.26)

 *

-11.62

(1.93)

 *

-1.07

(0.31)

 *

Weak Instrument

(Anderson-Rubin Wald test F)

 23.3 * 61.46 * 12.54 *
Wald test for endogeneity χ2(1) 30.56 * 46.68 * 5.75 †
Hospitals only

0.28

(0.20)

-3.21

(1.52)

 †

-0.50

(0.28)

Weak Instrument

(Anderson-Rubin Wald test F)

 2.04 4.45 † 3.21
Wald test for endogeneity χ2(1) 2.43 1.02 0.87

Note: *: p-value < 0.01; †: p-value < 0.05