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. Author manuscript; available in PMC: 2023 Mar 24.
Published in final edited form as: Sci Total Environ. 2022 Aug 6;850:157830. doi: 10.1016/j.scitotenv.2022.157830

Table 2:

Results from 100 repeated holdouts testing the association between the phthalate WQS index and PMA at first growth spurt (latency) and slope of the first growth spurt (growth rate), controlling for sex, SGA, NICU morbidity score, and year of birth.

Outcome Parameter Mean Median 2.5th percentile 97.5th percentile
Latencya WQS 0.17 0.21 −0.39 0.64
WQS2 −0.045 −0.049 −0.103 0.030
Growth rateb WQS 0.13 0.13 0.05 0.21
a

N=101 (training n~40, validation n~61); a nonlinear effect was assessed by including a WQS*WQS term

b

N=96 (training n~38, validation ~58); βs were constrained in the positive direction; log transformed growth rate to meet assumptions of linear regression