Ecological momentary assessment of affect, stress, and binge-purge behaviors: day of week and time of day effects in the natural environment.
OBJECTIVE
The present study examined ecological momentary assessments of binge/vomit behavior, mood, and type and severity of stressors in a sample of 133 women with bulimia nervosa.


METHODS
Participants completed an ecological momentary assessment protocol for a period of 2 weeks.


RESULTS
Mixed-effects and multilevel logistic models revealed significant variation across time of day and day of the week in the occurrence of binging, vomiting, positive and negative affect, and the severity and types of stressful events.


CONCLUSIONS
These findings explicate how momentary and daily experiences vary in the natural environments of women with bulimia nervosa, and document critical time periods for intervention.
Smyth
Joshua M
JM
Department of Psychology, Syracuse University, Syracuse, New York, USA. jmsmyth@syr.edu
Wonderlich
Stephen A
SA
Sliwinski
Martin J
MJ
Crosby
Ross D
RD
Engel
Scott G
SG
Mitchell
James E
JE
Calogero
Rachel M
RM
D000328:Adult; D000339:Affect; D052018:Bulimia Nervosa / Q000453:epidemiology* / Q000523:psychology*; D039721:Diagnostic and Statistical Manual of Mental Disorders; D005260:Female; D006801:Humans; D016015:Logistic Models; D010507:Periodicity; D012720:Severity of Illness Index; D012931:Social Environment; D013315:Stress, Psychological; D013997:Time Factors