Table 4.

Item response probabilities and class membership probabilities for the three-class solution. Response probabilities indicate the likelihood that a patient who is a member of this latent class would endorse a particular reason for nonadherence (e.g., for the reason “You were out of your routine,” it is highly probable that patients in the capacity+motivation and capacity class would endorse this item, but that patients in the no clear reasons class would not). Standard errors are reported in parentheses; response probabilities greater than .50 are in bold.

Reason	Item Response Probabilities
	Capacity	Capacity+ Motivation	No Clear Reasons
Class Membership Probabilities	.45 (.06)	.14 (.04)	.41 (.06)
You forgot.	.82 (.06)	.77 (.10)	.32 (.08)
You were out of your routine.	.76 (.07)	.65 (.12)	.19 (.07)
You had other things to deal with.	.60 (.08)	.66 (.12)	.08 (.04)
You did not have the heart medication with you.	.64 (.07)	.53 (.12)	.12 (.07)
You were feeling down or upset.	.20 (.06)	.63 (.12)	.00 (.01)
You could not get answers to your questions about why you needed to take the heart medication.	.01 (.02)	.63 (.13)	.01 (.02)
You did not think the heart medication would help you live a longer life.	.00 (.01)	.61 (.14)	.03 (.03)
You did not want to be reminded about your heart problem.	.03 (.03)	.58 (.13)	.02 (.02)
The heart medication caused side-effects.	.09 (.05)	.49 (.12)	.25 (.06)
You ran out of the heart medication.	.37 (.07)	.39 (.12)	.07 (.05)
There was no-one to help you.	.12 (.05)	.39 (.12)	.00 (.01)