Table 6: Results of logistic regression analysis for two markers of preeclampsia in two time sessions, first and second trimesters (4 variables in sum).

ModelConstantPAPPA coefficient
(95% CI)
PP13 coefficient
(95% CI)
PAPPA coefficient
(95% CI)
PP13 coefficient
(95% CI)
Chi-square
( 𝑃 value)

Four variables Simultaneously24.534−0.979
(−1.578–0.380)
−0.087
(−0.131–0.043)
−0.064
(−0.107–0.020)
−0.026
(−0.037–0.015)
178.04
(<0.0001)