Control when :rls_sleep_onset: = 1, 2, or 3 and :rls_disturbed_sleep: = 1 or 2; Probable when :rls_sleep_onset: = 4 or 5 and :rls_disturbed_sleep: = 3; Definite when :rls_sleep_onset: = 4 or 5 and :rls_disturbed_sleep: = 4 or 5; Possible when any other combination