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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.