. 2021 Mar 18;9:661279. doi: 10.3389/fpubh.2021.661279

Table 5.

Estimated coefficients of the control variables.

Region	Coefficient	Estimated value	OLS se	*t_OLS*	White se	*t_White*
BRICS	${\hat{α}}_{1}$	0.0288	0.0152	1.8947*	0.0138	2.0869**
	${\hat{α}}_{2}$	−0.0028	0.0015	−1.8666*	0.0017	−1.6470*
	${\hat{α}}_{3}$	−0.0240	0.0203	−1.1822	0.0121	−1.9834*
ASEAN	${\hat{α}}_{1}$	0.0428	0.0260	1.6461*	0.0213	2.0093**
	${\hat{α}}_{2}$	−0.0106	0.0038	−2.7894***	0.0082	−1.2926
	${\hat{α}}_{3}$	−0.0125	0.0054	−2.3148***	0.0079	−1.5822*

OLS se (White se) refers to homogeneous (heterogeneous) standard deviations. The estimated coefficients of ${\hat{α}}_{1}$ is for consumer price index, ${\hat{α}}_{2}$ is for disposable income per capita, ${\hat{α}}_{3}$ is for services percent of GDP. ***, **, and *, respectively, indicate significance at the 1, 5, and 10% level.