Skip to main content
. 2008 Apr 1;31(4):473–480. doi: 10.1093/sleep/31.4.473

Figure 1.

Figure 1

Histogram of changes in insomnia-duration subtype between first and last completed interview. One unit corresponds to a change into the next more- or less-persistent insomnia subtype. Categories are no insomnia, occasional brief insomnia, recurrent brief insomnia, 2- to 3-week insomnia, and 1-month insomnia. See text for further details.