Variables

Cervical Length < 25 mm

PremaQuick

Actim Partus

Sensitivity = TP/(TP + FN) × 100

59/(59 + 49) × 100

= 54.6%

43/(43 + 65) × 100

= 39.8%

15/(15 + 93) × 100

= 13.9%%

Specificity = TN/(TN + FP) × 100

63/(63 + 49) × 100

= 56.3%

107/(107 + 5) × 100

= 95.5%

101/(101 + 11) × 100

= 90.2%

PPV = TP/(TP + FP) × 100

59/(59 + 49) × 100

= 54.6%

43/(43 + 5) × 100

= 89.6%

15/(15 + 11) × 100

= 55.5%

NPV = TN/(TN + FN) × 100

63/(63 + 49) × 100

= 56.3%

107/(107 + 65) × 100

= 62.2%

101/(101 + 93) × 100

= 52.1%

Accuracy = TP + TN/(TP + TN + FP + FN) × 100

59 + 63/(59 + 63 + 49 + 49) × 100 = 55.5%

43 + 107/(43 + 107 + 5 + 65) × 100 = 68.2%

15 + 101/(15 + 101 + 11 + 93) × 100 = 52.7%