Table 9.

Test of accuracy for the prediction of IUGR in cut off values of the different fetal electrocardiographic parameters.

Parameters' tested cut off values	Sensitivity (%)	Specificity (%)	Likelihood ratio (+)	PPV (%)	NPV (%)
QTc
0.40	66.7	25.0	0.89	40.0	50.0
0.42	80.0	15.0	0.94	41.4	50.0
0.43	86.7	5.0	0.91	40.6	33.3
RR
380.78	6.7	80.0	0.33	20.0	53.3
391.57	13.3	60.0	0.33	20.0	48.0
402.35	26.7	45.0	0.48	26.7	45.0
413.14	46.7	40.0	0.78	36.8	50.0
423.92	80.0	20.0	1.00	42.9	57.1
434.71	80.0	10.0	0.89	40.0	40.0
445.49	93.3	5.0	0.98	42.4	50.0
P Wave
39.89	13.3	85.0	0.89	40.0	56.7
44.83	33.3	70.0	1.11	45.5	58.3
49.78	46.7	55.0	1.04	43.8	57.9
54.72	53.3	30.0	0.76	36.4	46.2
59.67	80.0	10.0	0.89	40.0	40.0
64.61	93.3	10.0	1.04	43.8	66.7
PR
78.38	13.3	95.0	2.67	66.7	59.4
85.46	26.7	85.0	1.78	57.1	60.7
92.53	33.3	80.0	1.67	55.6	61.5
99.61	46.7	65.0	1.33	50.0	61.9
106.69	60.0	45.0	1.09	45.0	60.0
113.77	80.0	25.0	1.07	44.4	62.5
120.84	86.7	15.0	1.02	43.3	60.0
127.92	93.3	5.0	0.98	42.4	50.0
PQ
49.17	53.3	70.0	1.78	57.1	66.7
55.73	66.7	45.0	1.21	47.6	64.3
62.3	73.3	30.0	1.05	44.0	60.0
68.87	93.3	25.0	1.24	48.3	83.3
75.43	93.3	5.0	0.98	42.4	50.0
QRS
37.73	33.3	60.0	0.83	38.5	54.6
45.31	46.7	50.0	0.93	41.2	55.6
52.89	66.7	25.0	0.89	40.0	50.0
60.47	93.3	5.0	0.98	42.4	50.0
QT
246.76	20.0	20.0	0.25	15.8	25.0
257.37	60.0	15.0	0.71	34.6	33.3
267.99	80.0	10.0	0.89	40.0	40.0
PR/RR
0.21	33.3	90.0	3.33	71.4	64.3
0.24	46.7	75.0	1.87	58.3	65.2
0.26	53.3	50.0	1.07	44.4	58.8
0.28	80.0	30.0	1.14	46.2	66.7
0.3	93.3	15.0	1.10	45.2	75.0
0.32	93.3	5.0	0.98	42.4	50.0
HR
135.95	13.3	90.0	1.33	50.0	58.1
139.7	20.0	90.0	2.00	60.0	60.0
143.44	26.7	75.0	1.07	44.4	57.7
147.18	73.3	60.0	1.83	57.9	75.0
150.93	73.3	55.0	1.63	55.0	73.3
154.67	93.3	30.0	1.33	50.0	85.7