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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