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J Affect Disord. 2015 Dec 1;188:270-7. doi: 10.1016/j.jad.2015.08.039. Epub 2015 Sep 1.

The association between latent depression subtypes and remission after treatment with citalopram: A latent class analysis with distal outcome.

Author information

1
Department of Quantitative Health Sciences, University of Massachusetts Medical School, 368 Plantation Street, Worcester 01605, MA, United States. Electronic address: Christine.Ulbricht@umassmed.edu.
2
Center for Psychopharmacologic Research and Treatment, Department of Psychiatry, University of Massachusetts Medical School, Worcester, MA, United States.
3
Department of Quantitative Health Sciences, University of Massachusetts Medical School, 368 Plantation Street, Worcester 01605, MA, United States.

Abstract

BACKGROUND:

The objectives were to characterize latent depression subtypes by symptoms, evaluate sex differences in and examine correlates of these subtypes, and examine the association between subtype and symptom remission after citalopram treatment.

METHODS:

Latent class analysis was applied to baseline data from 2772 participants in the Sequenced Treatment Alternatives to Relieve Depression trial. Indicators were from the Quick Inventory of Depressive Symptomatology. Separate multinomial logistic models identified correlates of subtypes and the association between subtype and the distal outcome of remission.

RESULTS:

Four latent subtypes were identified: Mild (men: 37%, women: 27%), Moderate (men: 24%, women: 21%), Severe with Increased Appetite (men: 13%, women: 22%), and Severe with Insomnia (men: 26%, women: 31%). Generalized anxiety disorder, bulimia, and social phobia were correlated with Severe with Increased Appetite and generalized anxiety disorder, post-traumatic stress disorder, and social phobia with Severe with Insomnia. Relative to those with the Mild subtype, those with Severe with Increased Appetite (odds ratiomen (OR): 0.48; 95% confidence interval (CI): 0.25-0.92; OR women: 0.59; 95% CI: 0.41-0.86) and those with Severe Depression with Insomnia (ORmen: 0.65; 95% CI: 0.41-1.02; ORwomen: 0.45; 95% CI: 0.32-0.64) were less likely to achieve remission.

LIMITATIONS:

The sample size limited exploration of higher order interactions.

CONCLUSIONS:

Insomnia and increased appetite distinguished latent subtypes. Sex and psychiatric comorbidities differed between the subtypes. Remission was less likely for those with the severe depression subtypes. Sleep disturbances, appetite changes, and other mental disorders may play a role in the etiology and treatment of depression.

TRIAL REGISTRATION:

ClinicalTrials.gov NCT00021528.

KEYWORDS:

Clinical trials; Latent class analysis with distal outcome; Major depression; Subgroups

PMID:
26384013
DOI:
10.1016/j.jad.2015.08.039
[Indexed for MEDLINE]

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