Table 3

Sensitivity, specificity, predictive values at selected risk score and the predicted probability of GDM in test dataset

Model 1						Model 2
Risk score cut-off point	Sensitivity %	Specificity %	PPV*%	NPV* %	Predicted probability of GDM %	Risk score cut-off point	Sensitivity %	Specificity %	PPV* %	NPV* %	Predicted probability of GDM %
1.30	100.0	0.1	7.9	100.0	1.1465	3.50	100.0	0.2	7.9	100.0	1.0219
1.80	99.5	1.8	7.9	97.7	1.8949	4.00	99.7	2.1	8.0	98.8	1.6738
2.30	96.6	14.3	8.8	98.0	3.0861	4.60	95.1	16.5	8.8	97.5	3.0084
2.40	95.6	19.1	9.1	98.1	3.3997	4.70	93.5	20.9	9.2	97.4	3.3144
2.45	94.7	21.8	9.4	98.0	3.5678	4.75	90.6	23.8	9.2	96.7	3.4784
2.50	93.3	25.1	9.6	97.8	3.7438	4.80	89.9	26.3	9.4	96.8	3.6502
2.60	90.1	31.2	10.0	97.4	4.1214	4.90	87.9	32.4	10.0	96.9	4.0187
2.65	88.5	34.3	10.3	97.2	4.3235	5.00	85.7	38.1	10.6	96.9	4.4226
2.70	86.4	37.8	10.6	97.0	4.5351	5.04	84.0	40.8	10.8	96.8	4.5948
2.75	84.8	41.2	10.9	97.0	4.7566	5.07	82.7	42.5	10.9	96.6	4.7282
2.80†	82.1	44.8	11.2	96.7	4.9883	5.10†	81.8	44.4	11.1	96.6	4.8651
2.90	78.2	51.3	12.0	96.5	5.4842	5.20	77.5	50.6	11.8	96.3	5.3494
3.00	74.0	57.7	13.0	96.3	6.0262	5.30	72.3	56.3	12.4	96.0	5.8790
3.10	66.9	63.2	13.4	95.7	6.6180	5.40	69.7	62.1	13.5	96.0	6.4573
3.20	63.2	68.8	14.7	95.6	7.2635	5.50	64.8	67.3	14.4	95.7	7.0883
3.30	56.8	74.0	15.7	95.3	7.9666	5.60	59.9	72.1	15.5	95.5	7.7758
3.40	51.3	78.0	16.6	94.9	8.7312	5.70	53.7	76.6	16.4	95.1	8.5239
3.60	40.5	85.6	19.3	94.4	10.4621	6.00	39.7	86.5	20.0	94.4	11.1729
3.80	28.3	90.5	20.2	94.6	12.4892	6.34	25.6	93.0	23.8	93.6	15.0179
4.35	12.4	97.6	30.6	92.9	19.8308	6.70	12.7	96.9	25.9	92.9	20.2103

*PPV and NPV were calculated based on the prevalence of GDM in testing dataset (ie, 506/6444)
†The suggested cut-off points.
GDM, gestational diabetes mellitus; NPV, negative predictive value; PPV, positive predictive value.