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Table 1 Characteristics of persons released from provincial prison in 2010 and age- and sex-matched general population controls in Ontario, Canada

From: Primary care utilization in people who experience imprisonment in Ontario, Canada: a retrospective cohort study

Characteristic Prison release group, N=48,861 General population controls, N=195,444 p value*
Age- n (%) Median (IQRa) 32 (24-43) 32 (24-43) N/A
Sex- n (%) Male 42,754 (87.5%) 171,016 (87.5%) N/A
Female 6107 (12.5%) 24,428 (12.5%)
Self-reported raceb- n (%) Missing 4,499 (9.2%) - -
White 28,745 (58.8%) - -
Black 5,568 (11.4%) - -
Aboriginal 4,954 (10.1%) - -
Other 5,095 (10.4%) - -
Neighbourhood income quintile- n (%) Missing 2,317 (4.7%) 1,009 (0.5%) <.001
1 (lowest) 18,151 (37.1%) 39,076 (20.0%)
2 10,481 (21.5%) 39,113 (20.0%)
3 7,706 (15.8%) 39,044 (20.0%)
4 5,923 (12.1%) 39,978 (20.5%)
5 4,283 (8.8%) 37,224 (19.0%)
Rural/Small Town- n (%) Missing 1,573 (3.2%) 164 (0.1%) <.001
Yes 6,339 (13.0%) 20,659 (10.6%)
No 40,949 (83.8%) 174,621 (89.3%)
Time in provincial prison- median days (IQRa) Admission leading to initial 2010 release 10 (3-52) - -
Past five years 72 (12-230) - -
Time to reincarceration- median days (IQRa) 195 (69-490) - N/A
Person years of follow up (persons) In prisonc 6,685 (48,861) 26,738 (195,444) N/A
Post-releasec 0-6 days 932 (48,861) 3,745 (195,444)
7-29 days 2,929 (47,870) 12,299 (195,393)
30-89 days 6,917 (44,939) 32,037 (195,231)
90-179 days 8,960 (39,328) 47,921 (194,794)  
180-364 days 14,624 (33,538) 98,056 (194,158)  
365-730 days 23,251 (26,055) 192,449 (193,040)  
Number of ADGsa- n (%) Median (IQR) 4 (2-7) 3 (1-5) <.001
0-4 25,383 (51.9%) 136,412 (69.8%) <.001
5-9 17,395 (35.6%) 51,825 (26.5%)
≥10 6,083 (12.4%) 7,207 (3.7%)
Chronic disease prevalenced- n (%) Diabetes 2,341 (4.8%) 8,047 (4.1%) <.001
Hypertension 3,629 (7.4%) 17076 (8.7%) <.001
COPDa 2178 (4.5%) 3960 (2.0%) <.001
Asthma 8011 (16.4%) 26,939 (13.8%) <.001
CHFa 166 (0.34%) 507 (0.3%) 0.002
HIVa infection prevalenced- n (%) 330 (0.7%) 343 (0.2%) <.001
Mental disorders - n (%)prevalenced Mood disorders 3,318 (6.8%) 1,521 (0.8%) <.001
Schizophrenia 1,909 (3.9%) 696 (0.4%) <.001
Anxiety disorders 3,757 (7.7%) 2,336 (1.2%) <.001
Substance–related disorders 8,270 (16.9%) 2,392 (1.2%) <.001
  1. *For chi squared or t test. aIQR interquartile range, ADGsAggregated Diagnosis Groups, COPD Chronic obstructive pulmonary disease, CHF congestive heart failure, HIV human immunodeficiency virus. bData on race were not available for the general population. We did not modify the category names provided by the MCSCS, e.g. Aboriginal. cOr the corresponding dates for general population controls. dDiagnosis based on health administrative data