Decision aids (DA) v usual care (UC) and detailed (DDA) v simple decision aids (SDA) for helping patients make treatment and screening decisions*

OutcomesNumber of trialsComparisonsWeighted mean difference out of 100 (95% CI)†
*Abbreviations defined in glossary; RBI, RRR, NNT, and CI calculated from data in article using a random effects model. All significant differences favour decision aids over usual care or detailed over simple decision aids.
†Scale for knowedge ranged from 0 (no correct responses) to 100 (all accurate responses) and scale for conflict ranged from 0 (no decisional conflict) to 100 (extreme decisional conflict).
Knowledge9DA v UC19 (13 to 24)
9DDA v SDA4.4 (2.5 to 6.2)
Decisional conflict6DA v UC−5.8 (–8.6 to −2.9)
4DDA v SDA−1.0 (−4.5 to 2.5)
Weighted event ratesRBI (CI)NNT (CI)
Realistic expectations4DA v UC60% v 42%44% (11 to 88)6 (4 to 17)
4DDA v SDA69% v 47%45% (26 to 67)5 (4 to 8)
RRR (CI)
Preferences and uptake (major surgery)5DA v UC27% v 32%24% (9 to 37)Not significant
2DDA v SDA24% v 30%22% (–7 to 43)Not significant
Remaining undecided3DA v UC3% v 19%57% (30 to 73)7 (4 to 100)
Passive role7DA v UC15% v 21%32% (11 to 47)Not significant