TABLE 1.

Adapted Instruments and Items.

Instrument	What It Measures	Example of Original Item	1st Revision for New Instrument	Final Revision for New Instrument
Self-  determination  Scale	Beliefs about whether one  perceives oneself as the  origin of one’s actions  (“trait autonomy”)	“What I do is often not what I’d choose to do.”	“I was not really free to decide what I wanted.”	“I was not really free to decide what decide what I wanted. (reverse-scored)” “I was free to decide what I wanted.”
Rotter Locus  of Control  Scale	Beliefs about whether  outcomes are causally dependent on variations  in one’s own behavior	“By taking an active part in political and social affairs, the people can control world events.”	“By taking an active part in decision part in decision making, I was able to control the decision that was made.”	“I was actively involved in this decision.”
Multi-dimensional  Health Locus  of Control  Scale	Beliefs about whether  one’s health outcomes  are causally dependent  on variations in one’s  own behavior.	“If I get sick, it is my own behavior which determines how soon I get well again.”	“It was my own behavior that determined the decision that was made.”	“I had an influence on the decision about the protocol.”
General  Self-  efficacy  Scale	Beliefs about one’s ability  to successfully execute  behaviors required to  produce particular  outcomes.	“When I make plans, I am certain I can make them work.”	“When confronted with this decision, I was certain that I could make the decision for myself.”	Omitted
Decision  Self-  efficacy  Scale	Beliefs about one’s ability  to make effective  decisions about  treatment options.	“I feel confident that I can express my concerns about each choice.”	“When making this decision, I felt confident that I could express my medical team.”	“I was able to express my point of view about the decision.”
Decisional  Conflict  Scale	Beliefs about one’s  uncertainty and effective  decision making (e.g., feeling  the choice is informed,  values-based, and likely  to be implemented) for  a specific decision.	“I have enough support from others to make a choice.”	“When making this decision, I felt supported in making my own choice.”	“I was the one to choose.”
Admission  Experiences  Survey–Short  Form	Perceptions of coercion  when being admitted for  psychiatric hospitalization.	“People tried to force me to come to the hospital.”	“Someone took this decision away from me.”	“Someone took this decision away from me.”(reverse-scored) “Others made this decision against my wishes.” (reverse-scored)