Findings

What do systematic reviews say?

3 questions · 3 findings · 2 reviews

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No studies found 0 · 0%GRADE not reported 0 · 0%Very low 1 · 33.3%Low 2 · 66.7%Moderate 0 · 0%High 0 · 0%

Highest vs lowest green tea exposure

Rectal cancer risk (9 studies) · adults (aged at least 18 years)

Highest showed no clear difference in rectal cancer risk (9 studies) compared with lowest green tea exposure (low certainty).

1 finding from 1 review

Green tea (Camellia sinensis) for the prevention of cancer 2020 · Cochrane Headline outcomes only
RR 0.89 [0.75, 1.05]
356851 participants
Low

Highest vs lowest green tea exposure

Colorectal cancer risk (16 studies) · adults (aged at least 18 years)

Highest may leads to lower colorectal cancer risk (16 studies) compared with lowest green tea exposure (low certainty).

1 finding from 1 review

Green tea (Camellia sinensis) for the prevention of cancer 2020 · Cochrane Headline outcomes only
RR 0.84 [0.74, 0.96]
610295 participants
Low

Highest vs lowest selenium exposure

Colorectal cancer risk (16 studies) · Participants in non experimental cohort studies on selenium and cancer

It is very uncertain whether highest changes colorectal cancer risk No. of participants: 712,746 (6 observational… compared with lowest selenium exposure (very low certainty).

1 finding from 1 review

Selenium for preventing cancer 2018 · Cochrane Headline outcomes only
OR 0.82 [0.72, 0.94]
Studies not reported
Very low