Table 1.

Differences in pollution and other determinants of health at the Huai River

Outcome	North [1]	South [2]	Difference in means [3]	Adjusted difference (polynomial) [4]	Adjusted difference (local linear) [5]
PM10	119.5 (31.5)	90.8 (25.3)	28.8*** (5.0)	48.3*** (12.2)	41.7*** (12.9)
Predicted life expectancy, y	76.2 (1.6)	76.2 (1.8)	−0.0 (0.3)	−1.3 (1.0)	−1.2 (1.0)
P value from joint test of equality	—	—	<0.01***	<0.01***	0.23

The sample is restricted to DSP locations (n = 154) within 150 km of an air quality monitoring station. The results in column [4] are adjusted for a cubic in degrees of latitude north of the Huai River boundary, which is allowed to vary north and south of the boundary. In column [5], we report the estimated discontinuity at the Huai River using local linear regression with a triangular kernel and bandwidth selected by the method proposed by Imbens and Kalyanaraman (14) chosen separately for each variable. Differences in predicted life expectancy are calculated by OLS using all of the covariates in SI Appendix, Table S1. The local linear joint test of equality uses the same set of covariates and bandwidth selection method proposed by Imbens and Kalyanaraman (14) with a uniform kernel.

^***Significant at 1%.