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

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

Predominant category during the first hour of admission, N (%)a Cases
(N = 24)b
Controls (N = 100)c P-valuef
    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-valuef
    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  
  1. Abbreviation: FHR fetal heart rate tracings
  2. 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
  3. 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)
  4. 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)
  5. 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)
  6. 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)
  7. f P-value based on the Wilcoxon rank-sum test taking into account the ordinal nature of the predominant category