Table 5.

Relative odds of pregnancy complications associated with interquartile range increases in trimester-specific mean pollutant concentrations

Pollutant	Trimester	Interquartile Range	N (births)	n (complications)	UNADJUSTED ANALYES OR (95% CI)	ADJUSTED ANALYSESa OR (95% CI)
Hypertensive Disorders
PM10 (μg/m3)	1	10	18,278	217	0.96 (0.87–1.05)	1.03 (0.91–1.16)
	2	10	20,027	265	1.03 (0.95–1.12)	1.04 (0.93–1.15)
	3	10	17,850	167	1.06 (0.97–1.16)	1.02 (0.92–1.13)
NO2 (μg/m3)	1	34	18,278	217	0.69 (0.52–0.90)	1.03 (0.53–1.99)
	2	26	20,027	265	1.09 (0.90–1.31)	1.29 (0.80–2.07)
	3	32	17,850	167	1.49 (1.10–2.01)	1.24 (0.67–2.31)
SO2 (μg/m3)	1	13	18,278	217	0.81 (0.67–0.98)	1.18 (0.74–1.90)
	2	8	20,027	265	1.01 (0.92–1.11)	0.89 (0.69–1.14)
	3	8	17,850	167	1.09 (0.97–1.24)	0.71 (0.53–0.97)
Fetal-placental conditions
PM10 (μg/m3)	1	10	18,278	2,308	1.02 (0.99–1.05)	1.03 (0.99–1.07)
	2	10	20,027	2,552	1.00 (0.97–1.03)	1.00 (0.96–1.04)
	3	10	17,850	2,146	0.99 (0.97–1.02)	1.01 (0.98–1.04)
NO2 (μg/m3)	1	34	18,278	2,308	1.03 (0.94–1.12)	1.14 (0.91–1.41)
	2	26	20,027	2,552	1.02 (0.96–1.09)	0.98 (0.83–1.15)
	3	32	17,850	2,146	0.92 (0.85–1.01)	0.96 (0.80–1.15)
SO2 (μg/m3)	1	13	18,278	2,308	1.00 (0.95–1.06)	1.00 (0.86–1.16)
	2	8	20,027	2,552	1.01 (0.98–1.04)	0.97 (0.89–1.06)
	3	8	17,850	2,146	0.99 (0.95–1.03)	1.09 (1.00–1.20)

^aAdjusted for maternal education, district of maternal residence, maternal age, gestational age at first clinic visit, relative humidity, and temperature