Prevalence of seasonal affective disorder among U.S. Army soldiers in Alaska.
OBJECTIVE
The goal of this study was to examine the prevalence of seasonal affective disorder among 1,116 active duty men and 191 active duty women stationed at an Army installation in Alaska.


METHODS
Prevalence estimates of seasonal affective disorder (SAD) were calculated in two different ways. The first was based on the "classic" criteria in which only January and February are regarded as the winter months. The second was based on the "arctic" criteria in which November and December are included as winter months.


RESULTS
Prevalence estimates of classic SAD were 5.2% for men and 8.9% for women. Prevalence estimates of arctic SAD were 6.5% for men and 13.1% for women. Subjects who met arctic criteria but not classic criteria for SAD self-reported significantly more current depression than those who met classic criteria.


CONCLUSIONS
The question of whether individuals meeting arctic criteria have a more severe form of SAD may be an area worth exploring.
National Institute of Justice, Washington, DC 20531, USA.
Leora
L
Rosen
Kathryn H
KH
Knudson
Peggy
P
Fancher
D000328:Adult; D000367:Age Factors; D000413:Alaska / Q000453:epidemiology; D003866:Depressive Disorder / Q000453:epidemiology*; D005260:Female; D006306:Health Surveys; D006801:Humans; D008297:Male; D008889:Military Personnel / Q000523:psychology*; D011159:Population Surveillance; D015995:Prevalence; D016574:Seasonal Affective Disorder / Q000453:epidemiology*; D012621:Seasons; D017678:Sex Distribution