Intrapartum factors associated with neonatal hypoxic ischemic encephalopathy: a case-controlled study

Table 3 Comparison of the fetal heart rate tracing categorizations during the first hour after admission and last hour prior to delivery

Predominant category during the first hour of admission, N (%)^a	Cases (N = 24)^b	Controls (N = 100)^c	P-value^f
			0.20
Category 1	14 (58.3%)	71 (71.0%)
Category 1 or 2	2 (8.3%)	6 (5.8%)
Category 2	7 (29.2%)	2 (23.1%)
Category 2 or 3	1 (4.2%)	0
Category 3	0	0
Predominant category during the last hour prior to delivery, N (%)^a	Cases (N = 25)^d	Controls (N = 101)^e	P-value^f
			0.02
Category 1	1 (4.0%)	8 (7.9%)
Category 1 or 2	1 (4.0%)	11 (10.9%)
Category 2	20 (80.0%)	82 (81.2%)
Category 2 or 3	2 (8.0%)	0
Category 3	1 (4.0%)	0

Abbreviation: FHR fetal heart rate tracings
^aFor each patient the predominant category was defined as the most common rating among the four 15-min segments from the FHR tracings using the consensus ratings
^bOf the 26 HIE cases, 24 had FHR tracings available during the first hour after admission (20 had 4 interpretable segments, 3 had 3 interpretable segments, and 1 had 1 interpretable segment)
^cOf the 104 controls, 100 had FHR tracings available during the first hour after admission (80 had 4 interpretable segments, 11 had 3 interpretable segments, 5 had 2 interpretable segments, and 4 had 1 interpretable segment)
^dOf the 26 HIE cases, 25 had FHR tracings available during the last hour prior to delivery (23 had 4 interpretable segments, 1 had 3 interpretable segments, and 1 had 1 interpretable segment)
^eOf the 104 controls, 101 had FHR tracings available during the last hour prior to delivery (85 had 4 interpretable segments, 9 had 3 interpretable segments, 4 had 2 interpretable segments, and 3 had 1 interpretable segment)
^f P-value based on the Wilcoxon rank-sum test taking into account the ordinal nature of the predominant category

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