Table 5 The robustness test of self-rated health inequality index, replacing instrumental variable and using fixed effects models.

From: Air pollution, migrants’ health inequality, and China’s Cross-regional Medical Insurance Scheme: a moderating effect analysis

Variable

Robustness test 1

Robustness test 2

Robustness test 3

Self-rated health inequality index

Physical health inequality index

Physical health inequality index

AQI

0.0100***

(5.98)

0.0026***

(13.20)

0.00005*

(1.87)

Control variable

Yes

Yes

Yes

Observations

27,043

28,752

28,752

  1. *p < 0.1, **p < 0.05, and ***p < 0.01. Z-statistics are in parentheses.
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