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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