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. Author manuscript; available in PMC: 2021 Oct 4.
Published in final edited form as: Environ Int. 2021 Feb 25;151:106440. doi: 10.1016/j.envint.2021.106440

Table 3.

Adjusted risk ratio (95% CI) of preterm birth per 1-unit increase in PCA-derived factor scores from 384 mothers and 211 fathers in the Environment and Reproductive Health (EARTH) Study, 2005–2018.

PCA-derived factors Maternal Paternal
Risk Ratio (95% CI) a P values Risk Ratio (95% CI) b P values
DEHP-BPA factor 1.36 (1.00, 1.84) 0.05 1.47 (0.90, 2.42) 0.13
Paraben factor 0.93 (0.65, 1.32) 0.68 1.43 (0.86, 2.38) 0.17
High molecular weight phthalate factor 0.88 (0.61, 1.26) 0.49 0.67 (0.38, 1.17) 0.16
Low molecular weight phthalate factor 0.96 (0.65, 1.41) 0.82 0.89 (0.51, 1.52) 0.66

Note: PCA, Principal component analysis; di-(2-ethylhexyl) phthalate (DEHP). All four PCA-derived factors were mutually adjusted for in the maternal/paternal models.

a

Adjusted for age (continuous), BMI (continuous), ART (yes/no), smoking (ever/never), education (categorical), race (categorical).

b

Adjusted for maternal and paternal age (continuous), maternal and paternal BMI (continuous), maternal and paternal smoking (ever/never), maternal education (categorical), maternal race (categorical), ART (yes/no).