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Table 3 Number of maternities with a pregnancy incarceration, pregnant prisoners and prisoner controls

From: Preparing linked population data for research: cohort study of prisoner perinatal health outcomes

  Timing of incarceration(s) relative to pregnancy Pregnant prisonersa Prisoner controlsb Total
Birth out of prison Birth in prison Total Own controlsc Peer controls Total
Prison maternities During 166 31 197 197
Before and during 67 9 76 185 1,394 1,579 1,655
After and during 102 44 146 134 1,215 1,349 1,495
Before during and after 134 44 178 80 291 371 549
Total 469 128 597 399 2,900 3,299 3,896
Prisoner mothers During pregnancy 166 31 197 (113) 197
Before and during 67 9 76 (45) 1,065 1,065 1,141
After and during 96 36 132 (63) 746 746 878
Before during and after 116 37 153 (65) 220 220 373
Total 445 113 558 (286) 2,031 2,031 2,589
  1. Notes:
  2. a Pregnant prisoners have at least one maternity with an incarceration episode during pregnancy. Prisoner mothers can have more than one prison maternity or both prison and non-prison maternities
  3. b Contemporaneous maternities among women incarcerated between 1998 and 2006, but not during pregnancy
  4. c Own control prisoner mothers have both a maternities with pregnancy incarceration and maternity with pregnancy wholly in the community. These prisoner mothers have already been counted with pregnant prisoners
  5. – not applicable () numbers in brackets do not contribute to row total