UC San Diego

Study objectives

Depression is prevalent among patients with sleep disorders, and studies show associations between suicidal ideation and insufficient sleep. Using retrospective clinic records, we examined positive depression screening rates among adolescent sleep clinic patients relative to other subspecialty clinic patients. We also examined relationships between sleep diagnoses and positive depression screening rate in adolescent sleep clinic patients.

Methods

Data were analyzed from patients ages 12-18 (n = 12,520) who were screened for depression using the Patient Health Questionnaire-2 (PHQ-2). Those who screened positive were administered the PHQ-9. Logistic regression was used to examine effects of age, sex, race, ethnicity, and clinic on likelihood of a positive depression screen. Within sleep clinic patients (n = 308), demographic factors, sleep disorder diagnosis, and body mass index percentile were examined using logistic and linear regression.

Results

Among all patients screened, older age and female sex predicted positive depression screens. Sleep clinic patients were more likely to screen positive than patients in 9 other clinics [odds ratios 2.03-6.83]. Results were similar even when the PHQ-9 sleep item was excluded [odds ratios 2.18-6.41]. Within sleep clinic patients, sleep disorder diagnosis (eg, insomnia, obstructive sleep apnea) was predictive of a positive depression screen (χ²(1) = 10.88, P = .004): insomnia patients were most likely to be experiencing depression.

Conclusions

Adolescent sleep clinic patients are at increased risk for depressive symptoms. Among insomnia patients, risk was independent of age, sex, and obesity, suggesting a unique relationship between insomnia and affective distress, as has been found in adults. Assessing adolescents for sleep disorders should be prioritized, given the strong association with depression.