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Table 1 First-phase descriptive data for the variables birth year category, sex, birth country and marital status.

From: Long-term exposure to air pollution and hospital admissions for ischemic stroke. A register-based case-control study using modelled NOxas exposure proxy

   Cases
N (%)
Controls
N(%)
ORb 95% CI Controls, stratified by modelled residential outdoor NOx-levela
       ≤20 μg/m3
NOX
N (%)
>20 μg/m3
NOX
N (%)
Birth year 1923–1925 970 (20) 24 647 (4) 56 43–73 17 773 (4) 6 874 (5)
  1926–1930 1 262 (26) 45 059 (8) 40 30–52 33 078(8) 11 981 (9)
  1931–1935 876 (18) 47 814 (9) 26 20–34 35 590(8) 12 224(9)
  1936–1940 682 (14) 56 671 (10) 17 13–23 43 071(10) 13 600 (10)
  1941–1945 523 (11) 74 743 (13) 9.9 7.5–13 58 002(14) 16 741 (12)
  1946–1950 286 (6) 80 349 (14) 5.0 3.8–6.7 61 900(15) 18 449 (13)
  1951–1955 169 (3) 73 802(13) 3.2 2.4–4.4 55 545(13) 18 257 (13)
  1956–1960 79 (2) 73 277(13) 1.5 1.1–2.1 54 694(13) 18 583 (14)
  1961–1965 57 (1) 80 550(14) 1   59 699(14) 20 851 (15)
Sex Male 2 778 (57) 273 489(49) 1.3 1.3–1.4 207 222(49) 66 267 (48)
  Female 2 126 (43) 283 423(51) 1   212 130(51) 71 293 (52)
Birth country Nordic 213 (4) 20 238(4) 0.82 0.75–0.90 14637(3) 5601 (4)
  Other 501 (10) 68 325(12) 1.2 1.0–1.4 34 832 (8) 33 493 (24)
  Sweden 4 190 (85) 468 349(84) 1   369 893(88) 98 466 (72)
Marital status Divorced 895 (18) 95 811 (17) 1.2 1.1–1.3 64 031 (15) 31 780 (23)
  Widowed 985 (20) 36 155(6) 3.6 3.3–3.9 26 163 (6) 9 992 (7)
  Not married 495 (10) 92 016 (17) 0.71 0.64–0.78 64 211(15) 27 805 (20)
  Married 2 529 (52) 332 930(60) 1   26 4947(63) 67 983 (49)
  1. aThe residential outdoor annual means of NOX, modelled with a GIS and an emission database. The year for the annual mean is selected by distributing the controls over time with the same distribution as the date of diagnosis for the cases.
  2. b Crude odds ratio for ischemic stroke.