Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,776 questions · 7,311 findings · 959 reviews · Headline outcomes only

No studies found 1,498 · 20.5%GRADE not reported 303 · 4.1%Very low 1,839 · 25.2%Low 1,991 · 27.2%Moderate 1,277 · 17.5%High 403 · 5.5%

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Highest vs lowest selenium exposure

Any cancer risk No. of participants: 19,475 (3 RCTs) · Participants in trials with low risk of bias

Highest showed no clear difference in any cancer risk No. of participants: 19,475 (3 RCTs) compared with lowest selenium exposure (high certainty).

1 finding from 1 review

Highest vs lowest selenium exposure

Cancer mortality risk No. of participants: 17,448 (1 RCT) · Participants in trials with low risk of bias

Highest showed no clear difference in cancer mortality risk No. of participants: 17,448 (1 RCT) compared with lowest selenium exposure (high certainty).

1 finding from 1 review

Highest vs lowest selenium exposure

Colorectal cancer risk (16 studies) · Participants in trials with low risk of bias

Highest showed no clear difference in colorectal cancer risk No. of participants: 19,009 (2 RCTs) compared with lowest selenium exposure (high certainty).

1 finding from 1 review

Highest vs lowest selenium exposure

Non‐melanoma skin cancer risk No. of participants: 2027 (2 RCTs) · Participants in trials with low risk of bias

Highest showed no clear difference in non‐melanoma skin cancer risk No. of participants: 2027 (2 RCTs) compared with lowest selenium exposure (moderate certainty).

1 finding from 1 review

Highest vs lowest selenium exposure

Lung cancer risk (17 studies) · Participants in trials with low risk of bias

Highest showed no clear difference in lung cancer risk No. of participants: 19,009 (2 RCTs) compared with lowest selenium exposure (high certainty).

1 finding from 1 review

Highest vs lowest selenium exposure

Breast cancer risk (14 studies) · Participants in trials with low risk of bias

Highest showed no clear difference in breast cancer risk No. of participants: 802 (1 RCT) compared with lowest selenium exposure (moderate certainty).

1 finding from 1 review

Highest vs lowest selenium exposure

Bladder cancer risk No. of participants: 19,009 (2 RCTs) · Participants in trials with low risk of bias

Highest showed no clear difference in bladder cancer risk No. of participants: 19,009 (2 RCTs) compared with lowest selenium exposure (high certainty).

1 finding from 1 review

Highest vs lowest selenium exposure

Prostate cancer risk (13 studies) · Participants in trials with low risk of bias

Highest showed no clear difference in prostate cancer risk No. of participants: 18,942 (4 RCTs) compared with lowest selenium exposure (high certainty).

1 finding from 1 review

Intervention not reported

Caesarean section ‐ low risk group · nurses, midwives, physicians

The intervention showed no clear difference in caesarean section ‐ low risk group (high certainty).

1 finding from 1 review

Intervention not reported

Activities of daily living (ADL) (Barthel Index score 0 to 20; lower = 0; median 3‐month · adults with acute stroke

The intervention showed no clear difference in activities of daily living (ADL) (Barthel Index score 0 to 20; lower… (low certainty).

1 finding from 1 review

Intervention not reported

Subjective Health Status score (Assessment of Quality of Life Score 0 to 1; lower = 0; end of scheduled · adults with acute stroke

It is very uncertain whether the intervention changes subjective Health Status score (Assessment of Quality of Life Score… (very low certainty).

1 finding from 1 review

Arm support combined with alternative mouse vs conventional mouse alone

Incidence of upper body disorders (neck, shoulder, and upper extremity) Questionnaire followed by medical examination · office workers

Arm support combined with alternative mouse showed no clear difference in incidence of upper body disorders (neck, shoulder, and upper… compared with conventional mouse alone (moderate certainty).

1 finding from 1 review