Sleep and Circadian Rhythms
This variable is only available in MAP and MARS.
Severity of possible REM sleep behavior disorder (RBD) is assessed using a modified version of the Mayo Sleep Questionnaire (MSQ). Participants are asked to report the presence/absence of RBD symptoms by responding “yes” if the described event has occurred at least three times.
Severity of possible RBD ranges from 0 to 4 and is the number of symptoms reported.
Participants are asked the following questions (Yes=1, no=0 for all questions):
(Note: Very few participants report possible RBD.)