Table 1.

Descriptive characteristics of the study sample, LIFE Study 2005-2009.

	Full cohort		Complete protocol*
	Pregnant n=347	Not Pregnant n=153	Pregnant n=340	Infertile n=53
	Mean (SD)	Mean (SD)	Mean (SD)	Mean (SD)
Age, female (years)	29.8 (3.9)	30.4 (4.6)	29.7 (3.9)	30.6 (4.3)
Age, male (years)	31.6 (4.6)	32.2 (5.6)	31.6 (4.5)	32.4 (5.3)
Parity at baseline	0.7 (0.8)	0.5 (0.9)	0.7 (0.8)	0.2 (0.5)
Proximity to major roadway (meters)	841.1 (1158.1)	734.9 (1089.7)	843.4 (1165.6)	688.8 (747.7)

^*Pregnant or prospective 12-months of trying (infertile) with complete data including salivary alpha-amylase.