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

Table 3.

ICOC elasticity for treatment cost estimates with 1–3 years lagged

ICOC elasticity
OP costs IP costs Total
costs
OLS model lag 1 year

-0.02

(0.004)

 *

0.08

(0.03)

 **

-0.01

(0.006)

 *†
lag 2 years

0.01

(0.005)

 †

0.23

(0.03)

 *

0.04

(0.01)

 *
lag 3 years

0.03

(0.005)

 *

0.22

(0.04)

 *

0.06

(0.007)

 *
2SLS model lag1 year

1.07

(0.21)

 *

-23.32

(2.83)

 *

-1.93

(0.32)

 *

Weak Instrument

(Anderson-Rubin Wald test F)

 37.72 * 351.86 * 65.52 *
Wald test for endogeneity χ2(1) 39.51 * 353.67 * 61.78 *
lag 2 years

-0.34

(0.18)

-12.07

(1.94)

 *

-1.94

(0.34)

 *

Weak Instrument

(Anderson-Rubin Wald test F)

 3.85 † 83.24 * 58.98 *
Wald test for endogeneity χ2(1) 4.09 † 86.45 * 61.43 *
lag 3 years

-0.89

(0.22)

 *

-0.20

(1.51)

-0.91

(0.31)

 *

Weak Instrument

(Anderson-Rubin Wald test F)

 22.22 * 0.02 10.40 *
Wald test for endogeneity χ2(1) 23.59 * 0.08 11.78 *

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