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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