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

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



Table 3. Association between inverse distance weighted well count within 10-mile radius of maternal residence and preterm birth and term low birth weight.
Inverse distance weighted well counta 0 wells within 10 miles Low (first tertile) Medium (second tertile) High (third tertile) Cochran–Armitage trend test p-valueb
aFirst tertile, 1–3.62 wells/mile; second tertile, 3.63–125 wells/mile; third tertile, 126–1,400 wells/mile. bPerformed as two-tailed test on unadjusted logistic regression. cAdjusted for maternal age, ethnicity, smoking, alcohol use, education, and elevation of residence, as well as infant parity and sex. dAdjusted for maternal age, ethnicity, smoking, alcohol use, education, and elevation of residence, as well as infant parity, sex, and gestational age.
Preterm birth          
Live births (n) 65,506 18,884 18,854 19,384  
Cases (n) 4,849 1,358 1,289 1,274  
Crude OR 1 0.97 0.92 0.88 < 0.0001
Adjusted OR (95% CI)c   0.96 (0.89, 1.0) 0.93 (0.87, 1.0) 0.91 (0.85, 0.98)  
Term low birth weight          
Full-term live births (n) 60,653 17,525 17,565 18,104  
Cases (n) 2,287 525 471 432  
Crude OR 1 0.79 0.70 0.62 < 0.0001
Adjusted OR (95% CI)c   1.0 (0.9, 1.1) 0.86 (0.77, 0.95) 0.9 (0.8, 1)  
Mean difference in birth weight (g)d 0 5 (–2.2, 13) 24 (17, 31) 22 (15, 29)