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Table 3 Associations between inter-quartile range increases in entire pregnancy average air pollution exposures and preterm birth based on single pollutant models.

From: Traffic-related air toxics and preterm birth: a population-based case-control study in Los Angeles county, California

Exposure Metric Crude Adjusteda
  N (cases, controls) OR (95% CI) N (cases, controls) OR (95% CI)
NO LUR_Ub 10265, 102650 1.04 (1.02-1.06) 10134, 100467 1.03 (1.01-1.05)
NO LUR_Sc 7838, 60115 1.01 (0.98-1.04) 7745, 58874 0.99 (0.96-1.02)
NO2 LUR_U 10265, 102650 1.04 (1.02-1.07) 10134, 100467 1.04 (1.02-1.07)
NO2 LUR_S 7838, 60115 0.96 (0.93-0.99) 7745, 58874 0.97 (0.94-1.00)
NOx LUR_U 10265, 102650 1.04 (1.02-1.06) 10134, 100467 1.03 (1.01-1.05)
NOx LUR_S 7838, 60115 0.99 (0.96-1.02) 7745, 58874 0.98 (0.95-1.01)
Naphthalene 1092, 1914 1.28 (1.14-1.44) 1068, 1859 1.29 (1.14-1.45)
Benzo(a)pyrene 1092, 1914 1.07 (0.97-1.18) 1068, 1859 1.13 (1.02-1.25)
Benzo(g, h, i)perylene 1092, 1914 1.28 (1.12-1.45) 1068, 1859 1.34 (1.17-1.52)
Total PAHs 1092, 1914 1.30 (1.15-1.46) 1068, 1859 1.30 (1.15-1.47)
Benzene 5856, 31564 1.10 (1.07-1.14) 5787, 30922 1.09 (1.06-1.13)
PM10 OC 6157, 34743 1.13 (1.09-1.17) 6083, 34040 1.14 (1.10-1.19)
PM10 EC 6157, 34743 1.05 (1.01-1.09) 6083, 34040 1.06 (1.01-1.10)
PM25 OC 6146, 34643 1.13 (1.09-1.17) 6072, 33940 1.13 (1.09-1.17)
PM25 EC 6146, 34643 1.13 (1.09-1.18) 6072, 33940 1.12 (1.08-1.17)
Ammonium nitrate PM2.5 6760, 41618 1.18 (1.13-1.24) 6673, 40737 1.21 (1.16-1.27)
Biomass burning PM2.5 6742, 41351 1.09 (1.05-1.13) 6655, 40476 1.12 (1.08-1.16)
Diesel PM2.5 6751, 41469 1.10 (1.06-1.14) 6664, 40592 1.11 (1.07-1.15)
  1. a Adjusted for maternal age, race/ethnicity and education, and parity.
  2. b Unseasonalized LUR model estimates.
  3. c Seasonalized LUR model estimates.