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. Author manuscript; available in PMC: 2020 May 1.
Published in final edited form as: J Pain Symptom Manage. 2019 Jan 24;57(5):980–988.e9. doi: 10.1016/j.jpainsymman.2019.01.008

Table 2.

Exploratory Analysis of the 17-item questionnaire

Items Theoretical
construct		 Factor 1
Serving
as SDM
Domain		 Factor 2
Contemplation
Domain		 Factor 3
Readiness
Domain		 Communality1
1. How well informed are you about who can be a medical decision maker? Knowledge 0.89 −0.03 −0.02 0.74
2. How well informed are you about what makes someone a good medical decision maker? Knowledge 0.89 −0.12 0.06 0.75
3. How well informed are you about the types of decisions that you may have to make for your loved one in the future? Knowledge 0.70 0.09 0.03 0.62
4. How much have you thought about your role as your loved one’s medical decisionmaker? Contemplation 0.52 0.19 0.12 0.53
5. As of today, how confident are you that you could serve as your loved one’s medical decision maker? Self-efficacy 0.70 0.06 0.03 0.57
6. As of today, how confident are you that you could talk with your loved one about the care he/she would want if he/she were very sick or near the end of life? Self-efficacy 0.48 0.23 0.14 0.55
7. As of today, how confident are you that you could be part of a discussion with your loved one’s DOCTOR about the care your loved one would want if he/she were very sick or near the end of life? Self-efficacy 0.51 0.31 0.11 0.67
8. How much have you thought about talking with your loved one about whether or not there are certain health situations that would make your loved one’s life not worth living? Contemplation 0.29 0.24 0.38 0.62
9. How much have you thought about being part of a discussion with your loved one’s DOCTORS about whether or not there are certain health situations that would make your loved one’s life not worth living? Contemplation 0.06 0.49 0.30 0.57
10. How much have you thought about talking with your loved one about the care he/she would want if they were very sick or near the end of life? Contemplation 0.14 0.62 0.28 0.86
11. How much have you thought about being part of a discussion with your loved one’s DOCTORS about the care he/she would want if they were very sick or near the end of life? Contemplation 0.05 1.04 −0.12 1.00
12. How ready are you to formally discuss with your loved one your role as their medical decision maker? Readiness 0.38 −0.06 0.50 0.56
13. How ready are you to talk to your loved one about the kind of medical care he/she would want if they were very sick or near the end of life? Readiness −0.04 0.09 0.93 0.92
14. How ready are you to talk to your loved one about whether or not there are certain health situations that would make your loved one’s life not worth living? Readiness 0.16 0.07 0.72 0.76
15. How ready are you to be part of a discussion with your loved one’s DOCTOR about whether or not there are certain health situations that would make your loved one’s life not worth living? Readiness 0.20 0.22 0.49 0.63
16. How ready are you to be part of a discussion with your loved one’s DOCTOR about the kind of medical care your loved one would want if he/she were very sick or near the end of life? Readiness 0.00 0.42 0.46 0.63
17. How ready are you to ask your loved one’s DOCTOR questions to help you make a good medical decision for your loved one if your loved one was unable to speak for themselves? Readiness −0.11 0.47 0.28 0.37
1

The communality is the proportion of the variance of the item accounted for by the 3 factors solution. Ideally, the communality would be near 1 and would be caused by a near 1 loading on single factor, but communalities greater than 0.4 or 0.5 are typically considered acceptable.