Table 4 Various IPDS combinations with their cut-off scores and their sensitivity, specificity, predictive value of positive test (PVP) and predictive value of negative test (PVN) as well as proportion of cases correctly classified

1 - 11

3

0.89

0.57

0.76

0.68

0.73

4

0.77

0.71

0.73

0.75

0.74

5

0.68

0.9

0.88

0.74

0.79

1 - 6

2

0.95

0.58

0.7

0.91

0.77

3

0.69

0.81

0.78

0.72

0.74

4

0.43

0.94

0.89

0.62

0.68

4 - 8

2

0.82

0.74

0.76

0.8

0.78

3

0.62

0.9

0.87

0.7

0.76

4

0.34

0.99

0.96

0.6

0.66

1, 3 - 8

2

0.96

0.53

0.67

0.93

0.74

3

0.73

0.75

0.75

0.73

0.74

4

0.59

0.92

0.88

0.69

0.75

1, 4-6, 9

2

0.93

0.6

0.7

0.9

0.77

3

0.71

0.8

0.78

0.73

0.75

4

0.48

0.94

0.9

0.64

0.71