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. 2021 Apr 7;11:7596. doi: 10.1038/s41598-021-87218-7

Table 3.

Robustness check.

Explanatory variable Explained Variable: Perinatal mortality
(1) (2) (3) (4) (5) (6)
New Average PM2.5 (log) 1.127* 1.139**
(0.621) (0.451)
New Max PM2.5 (log) 1.222** 1.374***
(0.487) (0.342)
Average PM2.5 (log) 1.035*
(0.621)
Max PM2.5 (log) 1.758***
(0.554)
GDP per capita(log) − 5.133*** − 4.802*** − 2.847** − 2.834** − 2.876** − 2.449*
(1.082) (1.099) (1.378) (1.380) (1.370) (1.398)
bed_pop − 0.030 − 0.038 0.149*** 0.150*** 0.141*** 0.149***
(0.031) (0.031) (0.044) (0.044) (0.044) (0.044)
ha_pop − 0.066*** − 0.070*** − 0.075** − 0.077** − 0.073** − 0.079**
(0.024) (0.024) (0.035) (0.035) (0.035) (0.035)
Urbanization − 0.017 − 0.009 − 0.141 − 0.134 − 0.150* − 0.136
(0.063) (0.063) (0.088) (0.088) (0.088) (0.088)
Constant 28.681*** 30.520*** 27.426*** 26.596*** 27.877*** 20.730***
(5.056) (4.735) (5.703) (5.691) (5.396) (5.535)
Year fixed effects Y Y Y Y Y Y
Province fixed effects Y Y Y Y Y Y
Province*Time trend Y Y Y Y
Within Rsquared 0.737 0.741 0.897 0.897 0.898 0.897
Observations 434 434 434 434 434 434

Standard in parentheses, *p < 0.1, **p < 0.05, ***p < 0.01.