|  |  | Low birth weight | Mean birth weight in grams | ||||||
---|---|---|---|---|---|---|---|---|---|---|
Air pollution metrics | Inter-quartile range (IQR) in air pollution metrics | Number of subjects | Odds ratio per IQR increase in air pollution metrics | 95% confidence interval | p value | Change for per IQR increase in air pollution metrics | 95% confidence interval | p value | ||
Monitoring station measurements, nearest station approach without distance restrictions (b) | ||||||||||
NO 2 | 11.87 | 68,303 | 0.85 | 0.76 | 0.94 | < 0.01 | 36.24 | 30.50 | 41.98 | < 0.01 |
NO x | 27.70 | 68,303 | 0.93 | 0.86 | 1.00 | 0.06 | 25.31 | 20.84 | 29.78 | < 0.01 |
NO | 17.90 | 68,303 | 0.95 | 0.89 | 1.02 | 0.20 | 20.27 | 16.23 | 24.32 | < 0.01 |
CO | 0.48 | 68,303 | 0.96 | 0.88 | 1.04 | 0.28 | 22.79 | 18.23 | 27.35 | < 0.01 |
PM 10 | 6.76 | 68,303 | 0.94 | 0.87 | 1.01 | 0.09 | 20.74 | 16.68 | 24.79 | < 0.01 |
PM 2.5 | 5.10 | 61,623 | 0.93 | 0.84 | 1.02 | 0.11 | 26.83 | 21.56 | 32.11 | < 0.01 |
O 3 | 11.50 | 68,303 | 1.13 | 1.02 | 1.25 | 0.01 | −31.36 | −36.82 | −25.89 | < 0.01 |
Land Use Regression model predictions (b) | ||||||||||
NO 2 | 9.34 | 68,303 | 0.94 | 0.86 | 1.02 | 0.13 | 16.59 | 12.01 | 21.16 | < 0.01 |
NO x | 25.24 | 68,303 | 0.98 | 0.91 | 1.06 | 0.66 | 9.42 | 5.25 | 13.59 | < 0.01 |
CALINE4 predictions (b) | ||||||||||
NO x | 5.65 | 67,043 | 0.97 | 0.90 | 1.04 | 0.35 | 14.10 | 10.29 | 17.91 | < 0.01 |
CO | 0.08 | 67,043 | 0.96 | 0.90 | 1.04 | 0.31 | 15.09 | 11.27 | 18.91 | < 0.01 |
PM 2.5 | 1.36 | 67,043 | 0.99 | 0.92 | 1.06 | 0.74 | 5.94 | 2.32 | 9.57 | < 0.01 |
Traffic density, within buffers of different distances around roads (b) | ||||||||||
50 m | 12.91 | 68,303 | 1.00 | 1.00 | 1.01 | 0.52 | 0.06 | −0.21 | 0.32 | 0.68 |
75 m | 35.91 | 68,303 | 1.01 | 0.99 | 1.02 | 0.24 | −0.21 | −1.12 | 0.69 | 0.64 |
100 m | 53.91 | 68,303 | 1.02 | 1.00 | 1.05 | 0.06 | −0.51 | −2.00 | 0.97 | 0.50 |
150 m | 74.30 | 68,303 | 1.05 | 1.01 | 1.08 | 0.01 | −0.34 | −2.43 | 1.75 | 0.75 |
200 m | 84.33 | 68,303 | 1.05 | 1.01 | 1.09 | 0.01 | 0.06 | −2.29 | 2.42 | 0.96 |
250 m | 81.34 | 68,303 | 1.04 | 1.00 | 1.08 | 0.05 | 0.35 | −1.95 | 2.64 | 0.77 |
300 m | 76.57 | 68,303 | 1.02 | 0.99 | 1.06 | 0.21 | 0.22 | −1.67 | 2.11 | 0.82 |
Distance to the nearest road (b) | ||||||||||
Freeways | 1766.80 | 68,303 | 1.04 | 0.96 | 1.14 | 0.35 | −7.80 | −12.50 | −3.09 | < 0.01 |
Major roads | 253.05 | 68,303 | 0.94 | 0.87 | 1.01 | 0.07 | −1.95 | −5.42 | 1.51 | 0.27 |