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Table 2 Pregnancy characteristics of women in the study (i), crude and adjusted odds ratio (OR) and 95% confidence intervals for odds ratios (95%CI) comparing prison pregnancies with controls

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

     vs Prison controls vs Community controls
   Number Percentage Crude OR Adjusted OR (95% CI) Crude OR Adjusted OR (95% CI)
1st antenatal visit >20 weeks gestation       
Prison pregnancy (ii) 130 47.4 1.63 1.63 (1.24-2.14)* 6.82 4.05 (3.12-5.27)*
Prison controls (iii) 393 33.9 1.00 1.00   
Community (iv) 3928 10.1    1.00 1.00
Not booked at admission       
Prison pregnancy (ii) 55 19.0 1.31 1.17 (0.83-1.64) 8.92 3.24 (2.29-4.57)*
Prison controls (iii) 180 14.9 1.00 1.00   
Community (iv) 959 2.6    1.00 1.00
Maternal diabetes mellitus       
Prison pregnancy (ii) 1 0.3 0.45 0.43 (0.05-3.44) 0.55 0.41 (0.06-3.10)
Prison controls (iii) 9 0.7   1.00   
Community (iv) 237 0.6    1.00 1.00
Gestational diabetes       
Prison pregnancy (ii) 5 1.7 0.58 0.63 (0.24-1.62) 0.35 0.56 (0.23-1.39)
Prison controls (iii) 35 2.8 1.00 1.00   
Community (iv) 1799 4.6    1.00 1.00
Maternal hypertension       
Prison pregnancy (ii) 2 0.7 2.06 2.12 (0.39-11.65) 0.62 0.78 (0.19-3.31)
Prison controls (iii) 4 0.3 1.00 1.00   
Community (iv) 419 1.1    1.00 1.00
Gestational hypertension       
Prison pregnancy (ii) 8 2.8 0.77 0.80 (0.37-1.72) 0.41 0.49 (0.24-1.01)
Prison controls (iii) 42 3.5 1.00 1.00   
Community (iv) 2448 6.5    1.00 1.00
  1. (i) For each group, 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) Logistic regression, adjusted for maternal age, parity, smoking, Aboriginal and Torres Strait Islander origin, mental health and/or drug and alcohol disorder.
  6. *Result was significant (p0.05).