Table 5: Results of logistic regression analysis for two markers of preeclampsia in two time sessions, first and second trimesters.

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

First trimester10.958−1.060
(−1.566–0.553)
−0.100
(−0.133–0.067)
0.347
(0.209–0.575)
0.905
(0.875–0.935)
136.1
( 𝑃 < 0 . 0 0 1 )
Second trimester18.033−0.0915
(−0.1277–0.0553)
−0.0262
(−0.0346–0.179)
0.913
(0.880–0.946)
0.974
(0.966–0.982)
138.9
( 𝑃 < 0 . 0 0 1 )