Table A6:

Robustness Checks

	(1)	(2)	(3)
	Low Birth Weight	Term Birth Weight	Premature Birth
Panel A: Mom Born in Pennsylvania
Within 2.5 km * post	0.0128***	−50.87***	−0.00523
	(0.00466)	(15.99)	(0.00645)
Observations	17,491	15,814	17,155
R-squared	0.022	0.081	0.012
Pre-drilling Mean	0.0576	3415	0.0791
Panel B: Top 10 Major Production Counties
Within 2.5 km * post	0.0160*	−44.52***	−0.00303
	(0.00726)	(12.03)	(0.0104)
Observations	15,052	13,627	14,789
R-squared	0.025	0.081	0.017
Pre-drilling Mean	0.0573	3415	0.0790
Panel C: Top 10 Major Drilling Counties
Within 2.5 km * post	0.0175**	−46.66***	0.000296
	(0.00576)	(12.36)	(0.00978)
Observations	13,208	11,951	12,957
R-squared	0.024	0.076	0.016
Pre-drilling Mean	0.0559	3423	0.0783

Notes: Each coefficient is from a different regression. The sample is limited to singleton births, the sample with a well/permit within 2.5 km and to the panel headings listed. All regressions include indicators for month and year of birth, month*year, residence county indicators, an indicator for drilling before birth (defined by closest well), an indicator for residence within 2.5 km of a well or future well and the interaction of interest of Within 2.5km*post-drilling. Maternal characteristics include mother black, mother Hispanic, mother education (hs, some college, college), mother age (19–24,25–34, 35+), female child, WIC, smoking during pregnancy, marital status and payment type (private insurance, medicaid, self-pay, other). Indicators for missing data for these variables are also included. Standard errors are in parentheses and clustered at the mother’s residence county.

Significance:

^*p<0.10,

^**p<0.05,

^***p<0.01.