| Outcome |
Overall effect |
Treatment decision |
Screening decision |
Video/computer decision aid |
Audio/pamphlet Decision aid |
Base risk control |
Removal of outliers* |
| Knowledge ‐ decision aid versus usual care |
15.2 (11.7 to 18.7) |
16.5 (11.9 to 21.2) |
13.1 (7.7 to 18.5) |
21.3 (16.3 to 26.2) |
11.9 (8.3 to 15.6) |
15.5 (11.3 to 19.8) |
17.3 (13.6 to 20.9) (*Bekker 2004, Gattellari 2003, Johnson 2006) |
| Accurate risk perceptions ‐ probabilities versus no probabilities |
1.6 (1.4 to 1.9) |
1.6 (1.4 to 1.9) |
1.6 (1.1 to 2.3) |
No data |
1.6 (1.4 to 1.9) |
1.3 (1.2 to 1.5) (P = 0.3) |
1.5 (1.3 to 1.7) (*Gattellari 2003) |
| Uninformed subscale of the Decisional Conflict Scale ‐ decision aid versus usual care |
−8.4 (−11.9 to −4.8) |
−9.4 (−13.3 to −5.5) |
−3.5 (−12.9 to 5.8) |
−12.6 (−19.5 to −5.8) |
−4.9 (−7.6 to −2.3) (P = 0.06) |
−5.4 (−7.7 to −3.2) (P = 0.11) |
−6.2 (−8.4 to −4.1) (P = 0.06) (*Montgomery 2003) |
| Unclear values subscale of the Decisional Conflict Scale ‐ decision aid versus usual care |
−6.3 (−10.0 to −2.7) |
−6.0 (−9.8 to −2.3) |
Insufficient data |
−8.0 (−15.1 to −1.0) |
−4.5 (−8.4 to −0.6) |
−3.6 (−6.8 to −0.5) |
−4.0 (−6.7 to −1.3) (*Montgomery 2003) |
