Table 5. Prediction for the occurrence of superimposed preeclampsia according to significant variables selected by logistic regression analysis at booking.

	SE %	SP %	PPV %	NPV%	Positive LR (95% CI)
Previous preeclampsia (1)	49	87	53	85	3.76 (1.82–7.75)
MAP≥95 mmHg (2)	82	55	35	91	1.81 (0.83–3.98)
Composite variable1or 2	88	47	33	93	1.65 (0.67–4.10)
Composite variable 1and 2	43	94	70	85	7.71 (3.20–18.57)

SE: sensitivity, SP: specificity, PPV: positive predictive value, NPV: negative predictive value, LR: likelihood ratio.

Composite variable 1and 2: all both are present: previous preeclampsia, MAP≥95 mmHg.

Composite variable 1or2: at least one of: previous preeclampsia, MAP≥95 mmHg.