Case-Control Study on Occupational Exposure to Extremely Low-Frequency Electromagnetic Fields and the Association with Meningioma

Table 2

Odds ratio (OR) and 95% confidence interval (CI) for meningioma (,592) for occupational exposure to ELF-EMF in time windows, 1–14 and 15+ years before diagnosis. Unconditional logistic regression, adjusted for age at diagnosis, gender, socioeconomic index (SEI), and year of diagnosis. Exposure the year before diagnosis was excluded (“1-year lag”).

Cumulative exposure (µT-years)	Meningioma (,592)
	Ca/Co	OR	95% CI
1–14 years
<0.91			-
0.91–<1.42			0.8–1.1
1.42–<1.82			0.8–1.2
1.82–<2.75			0.8–1.3
2.75+			0.8–1.3
p, linear trend			0.71
15+ years
<1.44			-
1.44–<2.55			0.8–1.1
2.55–<4.17			0.6–0.95
4.17–<6.59			0.7–1.1
6.59+			0.6–1.1
p, linear trend			0.28

Cut points at 25th, 50th, 75th, and 90th percentile for controls in each time window.