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Table 2 Summary risk estimates of the association between tea and coffee consumption and brain cancer risk

From: Association between tea and coffee consumption and brain cancer risk: an updated meta-analysis

Subgroups Tea consumption (highest vs. lowest category) Coffee consumption (highest vs. lowest category)
Studies, n RR (95% CI) I2 (%) P heterogeneity Studies, n RR (95% CI) I2 (%) P heterogeneity
All studies 8 0.897 (0.739–1.088) 29.9 0.189 11 0.785 (0.580–0.984) 65.6 0.001
Glioma 7 0.846 (0.683–1.047) 24.6 0.241 10 0.760 (0.548–0.972) 63.9 0.003
Cohort 6 0.891 (0.755–1.051) 0.0 0.471 8 0.858 (0.700–0.992) 20.1 0.270
Case-control 2 0.658 (0.199–2.179) 81.5 0.020 3 0.507 (0.142–1.810) 90.1 < 0.001
America 4 0.798 (0.646–0.986) 0.0 0.595 6 0.912 (0.740–1.124) 0.0 0.520
Europe 2 1.080 (0.828–1.410) 0.0 0.792 2 1.070 (0.793–1.444) 0.0 0.433
Asia 2 0.643 (0.205–2.016) 79.9 0.026 2 0.217 (0.042–0.896) 84.9 0.010
Oceania 1