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Table 1 Distribution of selected characteristics of the entire cohort, Quebec, 2000–2013

From: Long-term exposure to fine particulate matter and ozone and the onset of systemic autoimmune rheumatic diseases: an open cohort study in Quebec, Canada

Variable Number at cohort entry (percentage) Pearson-years of observation
Agea 20–44 3,646,390 (57.1) 28,548,549
45–64 1,794,103 (28.1) 25,477,943
65 +  942,017 (14.8) 13,484,923
Sex Male 3,108,864 (48.7) 32,380,859
Female 3,273,646 (51.3) 35,730,556
Material deprivation Quintile 1 1,244,647 (19.5) 12,952,185
Quintile 2 1,241,466 (19.4) 13,214,565
Quintile 3 1,267,927 (19.9) 13,510,431
Quintile 4 1,258,677 (19.7) 13,219,538
Quintile 5 1,230,893 (19.3) 12,606,293
Missing 138,900 (2.2) 2,008,403
Urban–rural residence Rural 1,378,184 (21.6) 31,108,277
Major CMAa (Montreal) 2,969,913 (46.5) 13,420,259
Other CMAs 1,238,883 (19.4) 8,581,158
Census Agglomeration 795,530 (12.5) 14,401,721
  1. aWe split age into the three categories to facilitate comparison with the previous studies [3, 16]. CMA census metropolitan area