Table 2.

Strength. Numbers of cases (Ca), controls (Co), and odds ratio (OR) with 95% confidence interval (CI) for glioma in case-control studies in the highest category of cumulative use in hours for mobile phone use.

	Ca/Co	OR	95% CI
Interphone 2010
Cumulative use ≥ 1,640 h	210/154	1.40	1.03–1.89
Coureau et al. 2014
Cumulative use ≥ 896 h	24/22	2.89	1.41–5.93
Hardell and Carlberg 2015
Cumulative use ≥ 1,640 h	211/301	2.13	1.61–2.82
Turner et al. 2016 (Interphone)
Cumulative use ≥ 1,640 h	59/46	2.82	1.09–7.32
Meta-analysis ∗
Cumulative use ≥ 1,640 h∗∗	445/477	1.90	1.31–2.76

^∗Based on Interphone [2], Coureau et al. [39], and Hardell and Carlberg [38].

^∗∗≥896 h used for Coureau et al.

Random-effects model used for all meta-analyses, based on test for heterogeneity in the overall group (“all mobile”).