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Table 2 Reasons for data censoring women by prisoner and mental health morbidity (MHM) status

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

  Non-prisoners Prisonersa All MHMb All Prisoners All study women
No MHMb MHMb No MHMb MHMb
Person records: 37,533 25,857 935 2,152 28,009 3,087 66,477
Reason censored N N N N N N N
 Duplicated births 5 0.1 4 0.2 1 1.1 0 0 4 0.1 1 0.3 10
 Too many maternities 8 0.2 6 0.2 1 1.1 7 3.3 308 10.9 8 2.6 22
 Non-chronological maternities 25 0.7 29 1.1 4 4.3 26 12.1 55 2 30 9.7 84
 Concurrent maternities 42 1.1 37 1.4 6 6.4 20 9.3 57 2 36 11.7 115
 Inconsistent incarceration data 29 31.0 314 145.9 312 11.1 343 111.1 343
 Missing incarceration data 18 19.3 41 19.1 41 1.5 59 19.1 59
 Conception in prison 28 29.3 35 16.3 35 1.2 63 20.4 63
Maternity reasonc 64 1.7 62 2.4 10 10.7 42 19.5 104 3.7 52 16.8 178
Study mothers: 37,469 25,795 850 1,739 27,534 2,589 65,853
Censored % 0.2 0.2 9.1 19.2 1.7 16.1 0.9
  1. Notes:
  2. a Prisoners were also divided into incarceration of 5 days or more (5 + days) or less than 5 days (<5 days). These results are shown in the [see Additional file 2: Table S2A]
  3. b Women with mental health morbidity (MHM) had either a mental health admission episode or were authorised or receive opiate substitution therapy (OST)
  4. c Women censored for inconsistent maternity data have one or more of the first four listed reasons for data censoring
  5. dThese mothers were retained in the study and their linked records used for further analysis
  6. ‰ rate per 1,000 person records % rate per 100 person records – not applicable