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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