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Table 2 Blood loss in relation to randomization

From: No reduction in instrumental vaginal births and no increased risk for adverse perineal outcome in nulliparous women giving birth on a birth seat: results of a Swedish randomized controlled trial

 

Experimental group

Control group

RR/mean difference

p-value

   

(95% CI)

 
 

n = 500

n = 502

  
 

n (%)

n (%)

  

Blood loss

    

0-499 ml

207 (41.4)

252 (50.1)

1.0 Ref.

 

500-999 ml

214 (42.8)

178 (35.4)

1.20 (1.03-1.41)

0. 007

1000-1499 ml

44 (8.8)

39 (7.7)

1.13 (0.94-1.47)

0. 225

1500 ml or above

32 (6.4)

33 (6.5)

1.1 (0. 84-1.42)

0. 622

Mean blood loss in ml. (SD)

652 (± 444)

606 (± 461)

45.9

0. 109

Manuel removal of placenta*

13 (2.6)

16 (3.0)

0.90 (0.59-1.35)

0. 579

Blood transfusion*

19 (3.8)

22 (4.4)

0.93 (0.66-1.29)

0. 641

Hb 36-48 hours postpartum g/l (SD)

111 (±16)

113 (±15)

- 1, 933

0. 101

Hb 8-12 week postpartum, g/l (SD)

112 (±48)

111 (±50)

0. 757

0. 900

  1. * Reference = Women not exposed to the studied variable