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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 factor

Total (Nā€‰=ā€‰137)

N (%)

Bleeding (Nā€‰=ā€‰18)

N (%)

No Bleeding (Nā€‰=ā€‰119)

N (%)

p

RR (95% CI)

PTTā€‰>ā€‰37ā€³ s

19 (14.6)

4 (21.1)

15 (78.9)

0.27

1.76

PTTā€‰ā‰¤ā€‰37ā€³ s

111 (85.4)

14 (12.6)

97 (87.4)

Ā 

(0.66ā€“4.72)

INR above 1.2

0 (0.0)

0 (0.0)

0 (0.0)

ā€“

ā€“

PTā€‰>ā€‰13.6ā€³ s

6 (4.6)

1 (16.7)

5 (83.3)

>ā€‰0.99

1.04

PTā€‰ā‰¤ā€‰13.6ā€³ s

125 (95.4)

17 (13.6)

114 (86.4)

Ā 

(0.72ā€“1.49)

Pltā€‰<ā€‰150 Ɨ 109/dl

1 (0.7)

0 (0.0)

1 (100.0)

>ā€‰0.99

0.42*

Pltā€‰ā‰„ā€‰150 Ɨ 109/dl

136 (99.3)

16 (11.8)

118 (88.2)

Ā 

(0.02ā€“7.45)

Abn results

26 (19.0)

5 (19.2)

21 (80.8)

0.34

1.09

Normal results

111 (81.0)

13 (11.7)

98 (88.3)

Ā 

(0.90ā€“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