Measures
Illness Uncertainty
Uncertainty was measured with the MUIS for adults
(MUIS-A [3]). The MUIS-A includes subscales for ambiguity and complexity. The ambiguity subscale has 16 items that are rated on a five-point scale from 1 (strongly disagree) to 5 (strongly agree). Scores can range from 16 to 80, and a higher score indicates more ambiguity. Items address cues about the state of the illness, such as being able to determine whether the illness is getting better or worse, the extent to which symptoms change unpredictably, and the extent to which being able to plan for the future is difficult due to unpredictability of the illness. Cronbach’s alpha in the current sample was 0.88.