Pilot Study of an Advance Care Planning Intervention Among Persons With Dementia

Feasibility of the information sheet is defined as the consent rate of family members who are offered enrollment. This will be calculatd as a percent of family members (number of enrolled participants/number of eligible participants offered enrollment)

Acceptability using an adapted tool (https://decisionaid.ohri.ca/eval_accept.html) which measures the ratings of comprehensibility of the information sheet among participants in the intervention group. Responses are reported descriptively in terms of proportions responding positively or negatively on each criteria.

Measures self-confidence or belief in one's abilities in decision making, including shared decision making. Eleven responses are measured on a 0-4 likert scale and a final summed scale is converted to a 0-100 range (scores are summed, divided by 11, then multiplied by 25). A score of zero means low self efficacy and score of 100 means extremely high self efficacy.

Measures family member self-efficacy in medical decision-making on behalf of a loved one. This scale has two versions, one for conscious and one for unconscious loved ones, which we will use accordingly. Thirteen items are measured on a 0-5 Likert scale with 1 being "cannot do at all" and 5 being "certain I can do." Higher scores indicate higher decision making self-efficacy.

Questions adapted from an 82-item questionnaire that measures advance care planning engagement in terms of knowledge, contemplation, self-efficacy and readiness. We include 10 questions from the measure. We used a mean imputation approach. All available data were included to create an average 5-point Likert score.

Measures perception of the usefulness of a decision support tool in preparing respondent for decision-making. Responses are on a Likert scale of 1-5 with one being "not at all" and five being " a great deal." Items are summed for scoring. A higher score indicates a higher level of perceived helpfulness in preparing for decision-making.

We adapted 9 items from the 17-item Advance Care Planning for Surrogates survey. Response options are on a 5-point Likert scale. We will calculate a summary score, with higher scores indicates a higher level of engagement.

Six questions to assess family members' knowledge about dementia were developed for this pilot study. All questions are true/false. Each correct answer will be coded as 1, each incorrect answer will be scored as 0. Higher scores indicate more knowledge.