Table 2.

Adjusted ORs (95% CIs)a for glioma and meningioma in relation to categorical indicators of occupational ELF exposure overall (1-year lag), INTEROCC study, 2000 to 2004, Australia, Canada, France, Germany, Israel, New Zealand, and the United Kingdom

GliomaMeningioma
Exposure metricCasesControlsOR (95% CI)aCasesControlsOR (95% CI)a
Cumulative exposure (μT-years)
 <2.114751,3341.00 (ref.)4731,2651.00 (ref.)
 2.11–<3.404541,3271.00 (0.85–1.18)4651,2780.96 (0.82–1.13)
 3.40–<5.004411,3440.93 (0.78–1.11)4141,2950.84 (0.70–0.99)
 5.00–<7.503708081.07 (0.88–1.31)2907831.05 (0.86–1.29)
 7.50+1995400.80 (0.63–1.00)1805240.89 (0.70–1.12)
PTrend-value0.080.51
Average exposure (μT)
 <0.114231,2681.00 (ref.)4261,2241.00 (ref.)
 0.11–<0.133981,2730.96 (0.82–1.13)4191,2440.94 (0.79–1.10)
 0.13–<0.175511,4111.04 (0.89–1.22)5101,3451.18 (1.00–1.38)
 0.17–<0.243308560.95 (0.80–1.14)2628091.03 (0.85–1.25)
 0.24+2375451.00 (0.82–1.23)2055231.08 (0.87–1.33)
PTrend-value0.990·41
Maximum exposed job (μT)
 <0.134531,3701.00 (ref.)5051,3411.00 (ref.)
 0.13–<0.174581,2900.92 (0.79–1.08)4391,2471.03 (0.88–1.20)
 0.17–<0.234301,2020.85 (0.73–1.00)3621,1460.98 (0.83–1.16)
 0.23–<0.623829470.92 (0.78–1.09)2868911.01 (0.84–1.21)
 0.62+2165440.80 (0.65–0.98)2305201.15 (0.94–1.42)
PTrend-value0.080·16
Exposure duration (y)
 <51,3333,8491.00 (ref.)1,3243,7161.00 (ref.)
 5–<152958050.90 (0.77–1.05)2557540.99 (0.84–1.17)
 15–<251423710.94 (0.76–1.16)1043530.85 (0.67–1.08)
 25+1693281.22 (0.99–1.51)1393221.30 (1.03–1.64)
PTrend-value0.260.20
  • aOR estimated using conditional logistic regression models stratified by country, region, sex, and 5-year age group at the reference date and adjusted for level of educational attainment. Cut points based on the 25th, 50th, 75th, and 90th percentile of the control exposure distribution. Tests for linear trend used Wald χ2 tests, with categorical medians modeled as ordinal variables.