A simple scoring system for the prediction of early pregnancy loss developed by following 13,977 infertile patients after in vitro fertilization

Table 3 Scoring system derived from the binary LR model

Sum of points	Estimated risk of miscarriage (%)	Sensitivity (%)	Specificity (%)	PPV (%)	NPV (%)	ACC (%)
− 8	0.18	100.00	0.00	13.30	−	13.30
− 7	0.24	100.00	0.00	13.30	−	13.30
− 6	0.31	100.00	0.00	13.30	−	13.30
− 5	0.54	100.00	0.00	13.30	−	13.30
− 4	0.81	100.00	0.11	13.32	100.00	13.40
− 3	1.24	99.69	0.79	13.36	94.34	13.95
− 2	1.85	99.28	5.32	13.86	97.95	17.82
− 1	2.84	93.89	34.88	18.12	97.38	42.74
0	4.20	91.72	46.37	20.79	97.33	52.40
1	7.33	80.23	83.80	43.18	96.51	83.32
2	11.02	75.98	91.74	58.53	96.14	89.64
3	15.57	70.91	96.22	74.21	95.57	92.85
4	22.03	68.01	97.55	81.01	95.21	93.62
5	30.03	62.84	98.79	88.87	94.54	94.01
6	39.55	66.87	98.11	84.44	95.07	93.95
7	50.59	57.04	99.02	89.89	93.76	93.43
8	60.50	49.48	99.41	92.82	92.77	92.77
9	70.67	39.13	99.57	93.33	91.42	91.53
10	78.54	26.71	99.83	95.91	89.87	90.10
11	84.90	15.63	99.92	96.79	88.53	88.71
12	89.51	6.11	99.95	95.16	87.40	87.47
13	92.65	3.00	100.00	100.00	87.04	87.10
14	95.42	0.52	100.00	100.00	86.76	86.76

LR logistic regression; PPV positive predictive value; NPV negative predictive value; ACC accuracy

ISSN: 2047-783X