Table 1 Odds ratios (ORs) and 95 % confidence intervals (CIs) from case–control studies on gliomas

Hardell et al. 2015 [17]

1.498

3.530

1.3 (1.1–1.6)

Coureau et al. 2014 [14]

253

892

1.24 (0.86–1.77)

Hardell et al. 2013 [15]

593

1368

1.6 (0.99–2.77)

Aydin et al. 2011 [2]

352

646

1.36 (0.92–2.20)

Cardis et al. 2011 [16]

553

1.762

0.93 (0.73–1.18)

Hardell et al. 2010 [19]

346

276

2.4 (1.4–4.1)

INTERPHONE Study 2010 [20]

2.708

2.972

0.81 (0.70–0.94)

Klaeboe et al. 2007 [10]

96

227

0.8 (0.5–1.1)

Takebayashi et al. 2008 [23]

88

118

0.7 (0.4–1.2)

Hepworth et al. 2006 [31]

966

1.717

0.94 (0.78–1.13)

Christensen et al. 2005 [12]

83

193

0.66 (0.46–0.95)

Lönn et al. 2005 [13]

371

674

0.73 (0.55–0.96)