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. 2021 Oct 14;29(11):16484–16502. doi: 10.1007/s11356-021-16821-y

Table 9.

Income-level estimations for the demand side

Models 13 14 15 16 17 18 19 20
LIC LMIC UMIC HIC LIC LMIC UMIC HIC
l. EFP

 − 0.2003*** [

0.054]

 − 0.1701*** [

0.042]

 − 0.2540*** [

0.035]

 − 0.1989*** [

0.042]

 − 0.2209*** [

0.060]

 − 0.1790*** [

0.048]

 − 0.2651*** [

0.037]

 − 0.1950*** [

0.043]

GDP

0.0077 [

0.006]

0.0252** [

0.009]

0.0202** [

0.008]

0.0589*** [

0.015]

0.0182y [

0.007]

0.0026 [

0.014]

0.0300 [

0.023]

0.0907*** [

0.025]

GDP2

 − 0.0004 [

0.001]

 − 0.0030** [

0.001]

 − 0.0004 [

0.001]

 − 0.0025 [

0.004]

 − 0.0042 [

0.004]

0.0060 [

0.005]

 − 0.0018 [

0.005]

 − 0.0202** [

0.010]

GDP3

0.0006 [

0.001]

 − 0.0009 [

0.001]

 − 0.0001 [

0.001]

0.0021 [

0.002]

cons

0.0247*** [

0.009]

0.0464*** [

0.015]

0.1125*** [

0.019]

0.2296*** [

0.004]

0.0214** [

0.009]

0.0362* [

0.0187]

0.1153*** [

0.018]

0.2287*** [

0.067]

obs 420 620 660 480 420 620 660 480
F-statistics

3.62

(0.00)

2.46

(0.00)

2.49

(0.00)

1.62

(0.00)

3.30

(0.00)

2.40

(0.00)

2.18

(0.00)

1.36

(0.02)

Rsqur 0.52 0.62 0.62 0.71 0.48 0.55 0.58 0.69
CD-stats

1.90

(0.057)

3.47

(0.001)

5.48

(0.000)

3.75

(0.000)

1.32

(0.187)

4.08

(0.00)

4.44

(0.000)

4.51

(0.000)

***1%, **5%, and *10%—significant levels. P-values are enclosed in parentheses. Standard errors are enclosed in square brackets