Generalised estimating equation model for maternal NP and hormones levels throughout all three trimesters.

a: Beta of a natural log-transformation of urinary NP concentrations after adjusting covariates including age, gestational age, BMI, parity, birth sex, and adverse pregnancy outcomes.
Parity: primiparas as a reference group.
Birth sex: female birth as a reference group.
β = estimated coefficient.
SE = standard error of the estimated coefficient.