Calculated - If any of the four insomnia symptoms (i.e. difficulty falling asleep, difficulty falling back to sleep, waking up frequently, waking up too early) have a frequency of more than 5-15 time a month, then it is a 1: yes.

Calculated: Count the number of insomnia symptoms (i.e. difficulty falling asleep, difficulty falling back to sleep, waking up frequently, waking up too early) with a frequency of more than 5-15 time a month.

Calculated: Sum of responses to insomnia symptoms (i.e. difficulty falling asleep, difficulty falling back to sleep, waking up frequently, waking up too early) where 0=0, 1=1, 2=3, 3=10, 4=25