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Evidence found and GRADE certainty

2,256 questions · 2,339 findings · 262 reviews

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No studies found 555 · 23.7%GRADE not reported 398 · 17%Very low 572 · 24.5%Low 476 · 20.4%Moderate 240 · 10.3%High 98 · 4.2%

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

Highest vs lowest selenium exposure

Any cancer risk No. of participants: 76,239 (7 observational studies) · Participants in non experimental cohort studies on selenium and cancer

It is very uncertain whether highest changes any cancer risk No. of participants: 76,239 (7 observational studies) compared with lowest selenium exposure (very low certainty).

1 finding from 1 review

Non-rinse conditioner + acetone-based total-etch adhesive vs Acetone-based total-etch adhesive

Radiological failure · Children with extensive decay involving the dental pulp in primary teeth

It is very uncertain whether non-rinse conditioner + acetone-based total-etch adhesive changes radiological failure compared with acetone-based total-etch adhesive (very low certainty).

1 finding from 1 review

Total-etching 36% phosphoric acid + acetone-based total-etch adhesive vs Acetone-based total-etch adhesive

Radiological failure · Children with extensive decay involving the dental pulp in primary teeth

It is very uncertain whether total-etching 36% phosphoric acid + acetone-based total-etch adhesive changes radiological failure compared with acetone-based total-etch adhesive (very low certainty).

1 finding from 1 review

Total-etching 36% phosphoric acid + acetone-based total-etch adhesive vs Non-rinse conditioner + acetone-based total-etch adhesive

Clinical failure · Children with extensive decay involving the dental pulp in primary teeth

It is very uncertain whether total-etching 36% phosphoric acid + acetone-based total-etch adhesive changes clinical failure compared with non-rinse conditioner + acetone-based total-etch adhesive (very low certainty).

1 finding from 1 review

Total-etching 36% phosphoric acid + acetone-based total-etch adhesive vs Acetone-based total-etch adhesive

Clinical failure · Children with extensive decay involving the dental pulp in primary teeth

It is very uncertain whether total-etching 36% phosphoric acid + acetone-based total-etch adhesive changes clinical failure compared with acetone-based total-etch adhesive (very low certainty).

1 finding from 1 review

Total-etching 36% phosphoric acid + acetone-based total-etch adhesive vs Non-rinse conditioner + acetone-based total-etch adhesive

Radiological failure · Children with extensive decay involving the dental pulp in primary teeth

It is very uncertain whether total-etching 36% phosphoric acid + acetone-based total-etch adhesive changes radiological failure compared with non-rinse conditioner + acetone-based total-etch adhesive (very low certainty).

1 finding from 1 review

Regional anaesthesia vs conventional pain control

Persistent pain 3 to 12 months after breast cancer surgery (We defined persistent postsurgical pain as new pain that did not exist before the operation, measured using differences in scores based on validated pain scales; patient interview between... · women with breast cancer undergoing elective surgery

Regional anaesthesia may leads to lower persistent pain 3 to 12 months after breast cancer surgery (We… compared with conventional pain control (low certainty).

1 finding from 1 review