Wb. Stiles et al., LACK OF SYNCHRONIZED SEASONAL-VARIATION IN THE INTENSITY OF PSYCHOLOGICAL-PROBLEMS, Journal of abnormal psychology, 102(3), 1993, pp. 388-394
Temporal variation in the subjective intensity of psychological proble
ms identified by 40 psychotherapy clients (most diagnosed as depressed
) was investigated longitudinally. Each client rated the intensity of
10 individualized problems 3 times per week (on Tuesdays, Thursdays, a
nd Sundays) for an average of 6 months. Ratings from all clients were
spread over 3 years. When scores were statistically adjusted for clien
t differences and average rate of improvement, no significant variatio
n among months was found, regardless of problem content or client gend
er. Standard assessment measures administered 4 times to each client a
lso failed to show systematic seasonal variation.