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Table 1 The impact of abnormal coagulation tests on bleeding

From: Coagulation tests or standardized questionnaire, which is better as a predictor of bleeding? A prospective study among children before tonsillectomy and/or adenoidectomy

Risk factorTotal (N = 137)
N (%)
Bleeding (N = 18)
N (%)
No Bleeding (N = 119)
N (%)
pRR (95% CI)
PTT > 37″ s19 (14.6)4 (21.1)15 (78.9)0.271.76
PTT ≤ 37″ s111 (85.4)14 (12.6)97 (87.4) (0.66–4.72)
INR above 1.20 (0.0)0 (0.0)0 (0.0)
PT > 13.6″ s6 (4.6)1 (16.7)5 (83.3)> 0.991.04
PT ≤ 13.6″ s125 (95.4)17 (13.6)114 (86.4) (0.72–1.49)
Plt < 150 × 109/dl1 (0.7)0 (0.0)1 (100.0)> 0.990.42*
Plt ≥ 150 × 109/dl136 (99.3)16 (11.8)118 (88.2) (0.02–7.45)
Abn results26 (19.0)5 (19.2)21 (80.8)0.341.09
Normal results111 (81.0)13 (11.7)98 (88.3) (0.90–1.33)
  1. N number, RR risk ratio, CI confidence interval, Plt platlets, Abn abnormal
  2. *Adjusted ratio with 0.5 added to each cell
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