Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

45 questions · 52 findings · 7 reviews · Headline outcomes only

No studies found 5 · 9.6%GRADE not reported 11 · 21.2%Very low 16 · 30.8%Low 17 · 32.7%Moderate 3 · 5.8%High 0 · 0%

Longer vs shorter duration of combination nicotine replacement therapy

Smoking cessation ‐ 16 weeks versus 8 weeks · people who smoke

It is very uncertain whether longer changes smoking cessation ‐ 16 weeks versus 8 weeks compared with shorter duration of combination nicotine replacement therapy (very low certainty).

1 finding from 1 review

Longer vs shorter duration of combination nicotine replacement therapy

SAEs · people who smoke

It is very uncertain whether longer changes overall SAEs ‐ 26 weeks versus 8 weeks compared with shorter duration of combination nicotine replacement therapy (very low certainty).

3 findings from 1 review

Longer self‐certification vs shorter self‐certification

CBA: Average duration of sickness absence periods in days · workers
2 findings from 1 review

Longer self‐certification vs shorter self‐certification

CBA: Number of sickness absence periods per worker · workers
2 findings from 1 review

Longer self‐certification vs shorter self‐certification

CBA: Average lost work time per 100 person‐years · workers
2 findings from 1 review