Study measures and timing of administration
| Measure | Baseline-patient | Baseline- SDM | Follow-up- Patient | Follow-up- SDM |
| Demographic information: Age (years), sex, marital status, highest completed education, type of home, language spoken, health literacy | X | X | – | – |
| Self-reported health and quality of life | X | |||
| Primary outcome: SDM ACP engagement (Modified from the ACP Engagement Survey for SDM,43 eg, knowledge of patient's wishes, and confidence making decisions, 5-point Likert scales) | – | X | – | X |
| Secondary outcome: SDM Decisional Conflict (Modified Decisional Conflict Scale49 in SDM) | – | X | – | X |
| Secondary outcome: Patient ACP engagement (ACP Engagement Survey 15-item version43 | X | – | X | – |
| Secondary outcome: Decisional Conflict (Modified Decisional Conflict Scale44) | – | – | X | – |
| Implementation outcome: Satisfaction and endorsement of intervention | – | – | X | – |
ACP, advance care planning; SDM, substitute decision-maker.