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Table 3 Labour and delivery outcomes of women in the study

From: Pregnancy, prison and perinatal outcomes in New South Wales, Australia: a retrospective cohort study using linked health data

   Pregnancy in prison (ii)
   Birth in prison Birth outside prison   Prison controls (iii) Community controls (iv)
   n % n % P value (v) n % P value (v) n % P value (v)
Onset of labour            
  Spontaneous 64 64.6 156 77.6 0.5 866 71.0 0.5 24064 61.5 <0.0001
  Induced 22 22.2 28 13.9 232 19.0 10116 25.9
  No labour 13 13.1 17 8.5 122 10.0 4924 12.6
  Missing/not stated 0   0    0    8 0.0  
  Total 99 100.0 201 100.0   1220 100.0   39112 100.0  
Presentation at birth            
  Vertex 88 88.9 180 89.6 0.06 1118 91.6 0.9 35533 90.8 0.21
  Non-vertex 10 10.1 8 4.0 64 5.2 1581 4.0
  Missing/not stated 1 1.0 13 6.5   38 3.1   1998 5.1  
  Total 99 100.0 201 100.0   1220 100.0   39112 100.0  
Method of birth            
  Normal vaginal 66 66.7 162 80.6 0.10 897 73.5 0.8 23669 60.5 <0.0001
  Instrumental vaginal 2 2.0 11 5.5 67 5.5 5126 13.1
  Caesarean section 28 28.3 25 12.4 243 19.9 10191 26.1
  Missing/not stated 3 3.0 3 1.5   13 1.1   126 0.3  
  Total 99 100.0 201 100.0   1220 100.0   39112 100.0  
  1. (i) For each group, live born singleton births and first births during the study period (index births) only.
  2. (ii) Births to women who were incarcerated for a minimum of five consecutive days during this pregnancy.
  3. (iii) Births to women were not incarcerated during this pregnancy, but were incarcerated at another time during the study period.
  4. (iv) A random 10% sample of births to women who were not incarcerated at all during the study period.
  5. (v) Chi-square tests were used to test for differences between study and control groups in labour and delivery outcomes.