Table 2.
Analysis of primary outcome and secondary outcomes
| Outcome | Categorical (Cat) Continuous (Con) | Decision aid arm (DA) | No decision aid arm (RP) | Notes |
|---|---|---|---|---|
| Decision quality | Cat | DQ2,DA | DQ2,RP | |
| Quality of Life (Generic) | Con | E2,DA – E0,DA | E2,RP – E0,RP | |
| Quality of Life (Condition-specific) | Con | W2,DA – W0,DA | W2,RP – W0,RP | |
| Depression | Con | P2,DA – P0,DA | P2,RP – P0,RP | |
| Knowledge | Cat | K0,DA | K0,RP | Modified version of the 5-item HK-DQI |
| Decisional conflict | Cat | DC0i,DA | DC0i,RP | Evaluated for each question individually (i = 1–4) |
| Treatment preference | Cat | Pref0,DA | Pref0,RP | |
| Preference for involvement in decision-making | Cat | CPS0,DA | CPS0,RP | |
| Willingness to have surgery | Cat | Will1,DA | Will1,RP | |
| Patient-reported shared decision-making | Cat Con |
C1,DA | C1,RP | Top-score: complete SDM vs. not complete Mean-score: complete SDM (12) to no SDM (0) |
| Decisional regret | Con | R2,DA | R2,RP | |
| Satisfaction | Con | S2,DA | S2,RP | Only for those who had surgery |
| Expectations | Cat | EXP2,DA | EXP2,RP | Only for those who had surgery |
| Surgical consult | Cat | Consult1,DA | Consult1,RP | |
| Surgery | Cat | Surg2,DA | Surg2,RP | |
| Concordance | Cat | Con2,DA | Con2,RP | |
| Feasibility: Recruitment | Con | Recruit0,DA + RP | Evaluated for the trial and reported as a percentage | |
| Feasibility: Questionnaire Completion | Con | Complete0,1,2,DA + RP | Evaluated for the trial and reported as a percentage | |
HK-DQI: Hip and Knee Decision Quality Instrument; SDM: Shared Decision Making