Simulated predictor characteristics

Model performance measures
 

OR of simulated predictors

Number of simulated predictors added to original model

Prevalence of simulated predictors

Proportion of population (%) with informative likelihood ratio ^{a}

Proportion of population (%) assigned to clinically distinct risk group ^{b}

AUC

Nagelkerke’s r^{2} (%)


2

3

10 %

0.0

27.2

0.71

10.0

2

3

20 %

0.0

29.9

0.73

11.7

2

3

40 %

0.0

34.8

0.74

12.9

2

5

10 %

0.0

28.9

0.73

11.8

2

5

20 %

0.0

33.3

0.75

14.6

2

5

40 %

0.0

39.2

0.77

16.6

6

3

10 %

0.0

54.4

0.83

29.4

6

3

20 %

63.6

63.6

0.87

37.1

6

3

40 %

70.2

70.0

0.88

37.1

6

5

10 %

66.9

66.9

0.88

40.6

6

5

20 %

72.0

72.0

0.92

50.7

6

5

40 %

73.8

73.8

0.93

51.2

 ^{a}Defined as the proportion of the population classified into a stratum with a likelihood ratio <0.10 or >10.0
 ^{b}Defined as the proportion of the population classified into a stratum with predicted risk meaningfully different than the baseline rate of preeclampsia in the population (<0.03 or >0.15)