Table 7: The validity factors of linear combinations of preeclampsia markers based on the three linear combinations.

Linear combinationCutoff Sensitivity
(95% CI)
Specificity %
(95% CI)
Positive predictive value %
(95% CI)
Negative predictive value %
(95% CI)
Surface under curve
(95% CI)

P A P P A 1 + ( P P 1 3 _ 1 / 1 0 ) ≤10.986.0
(77.6–91.2)
80.0
(70.8–87.3)
81.1
(72.4–88.1)
85.1
(76.3–91.6)
0.919
(0.884–0.954)
P A P P A 2 + ( P P 1 3 _ 2 / 3 ) ≤214.589.0
(81.2–94.4)
81.0
(71.9–88.2)
82.4
(73.9–89.1)
88.0
(79.6–93.9)
0.932
(0.886–0.957)
( 1 0 × P A P P A 1 ) + P P 1 3 _ 1 + ( P A P P A 2 / 2 ) + ( P P 1 3 _ 2 / 4 ) ≤238.591.0
(83.6–95.8)
91.0
(83.6–95.8)
91.0
(83.6–95.8)
91.0
(83.6–95.8)
0.968
(0.949–0.987)