Table 4.

Preterm birth and average VOC exposure, entire pregnancy, Camp Lejeune, 1968-1985

Exposure	Preterm birth		OR* (95% CI)	p value
	No #, %	Yes #, %
Tetrachloroethylene (PCE)
No exposure	3453, 31.4	269, 29.7	1.0 (ref.)
>0- < 35.8 ppb	3763, 34.2	326, 36.0	1.0 (0.9-1.2)	0.67
≥35.8- < 52.7 ppb	1895, 17.2	144, 15.9	0.9 (0.7-1.1)	0.32
≥52.7- < 81.4 ppb	1148, 10.4	81, 8.9	0.8 (0.6-1.0)	0.09
≥ 81.4 ppb	731, 6.7	86, 9.5	1.3 (1.0-1.6)	0.08
Trichloroethylene (TCE)
No exposure	1979, 18.0	150, 16.6	1.0 (ref.)
>0- < 1.7 ppb	4599, 41.8	383, 42.3	1.1 (0.9-1.3)	0.35
≥1.7- < 3.2 ppb	2209, 20.1	174, 19.2	1.0 (0.8-1.3)	0.74
≥3.2- < 9.8 ppb	1304, 11.9	124, 13.7	1.3 (1.0-1.6)	0.07
≥ 9.8 ppb	899, 8.2	75, 8.3	1.1 (0.8-1.5)	0.51
Benzene
No exposure	7820, 71.2	643, 71.0	1.0 (ref.)
>0- < 1.0 ppb	2474, 22.5	217, 24.0	1.1 (0.9-1.3)	0.43
≥ 1.0 ppb	696, 6.3	46, 5.0	0.8 (0.6-1.1)	0.17

*PCE was adjusted for mother’s race.