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Table 1 Selected characteristics of glioma cases and controls, INTEROCC study, 2000–2004*

From: Lifetime occupational exposure to metals and welding fumes, and risk of glioma: a 7-country population-based case–control study

Variable

Glioma cases

Controls

(n = 1800)

(n = 5160)

Age, mean (SD)

50.6 (10.0)

51.2 (9.7)

Males, n (%)

1116 (62.0)

2308 (44.7)

Education, n (%)

 Primary/secondary

766 (42.6)

2253 (43.7)

 Intermediate college/professional

391 (21.7)

1085 (21.0)

 Tertiary

643 (35.7)

1822 (35.3)

Proxy respondent, n (%)

257 (14.3)

23 (0.4)

Country, n (%)

 Australia

277 (15.4)

665 (12.9)

 Canada

169 (9.4)

649 (12.6)

 France

93 (5.2)

471 (9.1)

 Germany

366 (20.3)

1494 (29.0)

 Israel

282 (15.7)

698 (13.5)

 New Zealand

75 (4.2)

160 (3.1)

 United Kingdom

538 (29.9)

1023 (19.8)

Tumor histology, n (%)

 Glioblastomas

848 (47.1)

-

 Other

952 (52.9)

-

Occupational Prestige Scale (SIOPS), mean (SD)

43.2 (11.5)

44.0 (11.8)

Marital status, n (%)

 Single

159 (8.9)

431 (8.4)

 Married

1422 (79.3)

4035 (78.3)

 Divorced

142 (7.9)

494 (9.6)

 Widowed

62 (3.5)

190 (3.7)

 Don’t know

8 (0.4)

5 (0.1)

 Missing

7 (−)

5 (−)

Smoking status

 Never

906 (50.3)

2521 (48.9)

 Ex-smoker

386 (21.4)

1212 (23.5)

 Current

508 (28.2)

1427 (27.7)

Asthma, hay fever, eczema, n (%)

416 (23.1)

1380 (26.7)

  1. *Cases were statistically different from controls at p < 0.05 in terms of the following variables: age, sex, proxy respondent, country, occupational prestige, marital status, and asthma, hay fever and/or eczema