Birth Outcomes and Maternal Residential Proximity to Natural Gas Development in Rural Colorado

http://dx.doi.org/10.1289/ehp.1306722



Table 4. Association between inverse distance weighted well count within 10-mile radius of maternal residence and CHD diagnostic groups.
Inverse distance weighted well counta 0 wells within 10 miles Low (first tertile) Medium (second tertile) High (third tertile)
aFirst tertile, 1–3.62 wells/mile; second tertile, 3.63–125 wells/mile; third tertile, 126–1,400 wells/mile. bAdjusted only for residence elevation of because of low numbers. cAdjusted for maternal age, ethnicity, smoking, alcohol use, education, and elevation of residence, as well as infant parity and sex.
Conotruncal defects        
Cases (n) 40 14 13 15
Adjusted OR (95% CI)b 1 1.1 (0.57, 2.2) 1.1 (0.55, 2.0) 1.2 (0.6, 2.2)
Ventricular septal defects        
Cases (n) 210 68 59 84
Adjusted OR (95% CI)c 1 1.3 (0.96, 1.8) 1.1 (0.81, 1.5) 1.5 (1.1, 2.1)
Endocardial cushion and mitrovalve defects        
Cases (n) 39 14 12 12
Adjusted OR (95% CI)b   0.81 (0.42, 1.6) 0.80 (0.41, 1.5) 0.67 (0.33, 1.32)
Pulmonary artery and valve defects        
Cases (n) 137 52 62 66
Adjusted OR (95% CI)c 1 1.3 (0.89, 1.8) 1.5 (1.1, 2,1) 1.6 (1.1, 2,2)
Tricuspid valve defects        
Cases (n) 9 5 8 8
Adjusted OR (95% CI)b 1 2.6 (0.75, 9.1) 3.9 (1.3, 11) 4.2 (1.3, 13)
Aortic artery and valve defects        
Cases (n) 75 22 21 24
Adjusted OR (95% CI)c 1 1.1 (0.68, 1.9) 1.0 (0.62, 1.8) 1.2 (0.73, 2.1)
Patent ductus arteriosis        
Cases (n) 59 18 17 15
Adjusted OR (95% CI)c 1 1.0 (0.56, 1.8) 0.96 (0.55, 1.7) 0.83 (0.44, 1.5)