Table 3.

Association of gestational age with summative phthalate risk scores

	Logistic		Cox		AFT
Risk Score	OR	95% CI	HR	95% CI	% Change	95% CI
Average Exposure Analysis
ERS-Corr	1.81	(1.32, 2.52)	1.06	(0.98, 1.14)	−1.86%	(−2.98, − 0.73%)
ERS-Stepwise	2.14	(1.62, 2.87)	1.30	(1.16, 1.46)	−1.84%	(−2.78, − 0.88%)
WQS-Corr	1.66	(1.06, 2.64)	1.21	(1.06, 1.38)	−1.12%	(−2.25, −0.08%)
WQS-Stepwise	1.64	(1.01, 2.72)	1.06	(0.92, 1.23)	−0.57%	(−1.83, 0.70%)
Repeated Measures Analysis
ERS-Corr	1.89	(1.45, 2.51)	1.19	(1.10, 1.27)	−1.33%	(−2.03, −0.63%)
ERS-Stepwise	1.77	(1.37, 2.31)	1.23	(1.14, 1.34)	−0.85%	(−1.60, − 0.10%)

Phthalate measurements at each visit were log-transformed. All average exposure models were adjusted for average specific gravity, maternal age at first visit, race, education, and health insurance provider. All repeated measures models were adjusted for specific gravity at each visit, time of sample collection, maternal age at first visit, race, education, and health insurance provider. Bolded cells indicate significant (p < 0.05) odds ratios (OR), hazard ratios (HR), and percent changes (% Change). Odds ratios, hazard ratios and percent changes are all calculated on IQR (Interquartile Range) scale. Abbreviations: CI, Confidence Interval; Logistic, Logistic Regression; Cox, Cox Proportional Hazards Model; AFT, Accelerated Failure Time Model