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Table 1 Background variables 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
  n = 500 n = 502
  n (%) n (%)
Age groups   
<25 years 95 (19.0) 80 (15.9)
25-35 years 360 (72.0) 361 (72.0)
> 35 years 45 (9.0) 61 (12.1)
Smoking 55 (11.0) 66 (13.0)
Previous caesarean section 6 (1.2) 5 (1.0)
Gestational Age   
<37 + 6 weeks 19 (3.8) 22 (4.4)
38 + 0 - 40 + 6 weeks 381 (76.2) 376 (74.9)
>41 + 0 weeks 100 (20.0 ) 104 (20.7)
Body Mass Index (BMI) 23.3 23.6
Antenatal Hb in g/l (SD) 126 (± 11) 124 (± 13)