Quality of life, sleepiness and depressive symptoms in adolescents with insomnia: A cross-sectional study.

OBJECTIVES: To determine the prevalence of insomnia in a sample of Portuguese adolescents and assess its repercussions on HRQoL, daytime sleepiness and depressive symptomatology. DESIGN: We carried out a cross-sectional school-based study evaluating students from Viseu. LOCATION: Students from twenty-six public secondary schools in the county of Viseu, Portugal. PARTICIPANTS: Of 9237 questionnaires distributed, 7581 were collected (82.1%). We excluded from analysis all questionnaires from adolescents younger than 12 or older than 18 years of age (211) and unfilled forms (451). The sample comprised 6919 adolescents, the 7th to 12th grade, from 26 public secondary schools. INTERVENTIONS: None. MEASUREMENTS: Data gathering was done using a self-applied questionnaire. Insomnia was defined based on the Diagnostic and Statistical Manual of Mental Disorders - IV criteria. HRQoL was evaluated with the Quality of Life Health Survey SF-36, depressive symptomatology with BDI-II and daytime sleepiness with the Epworth Sleepiness Scale. RESULTS: Prevalence of insomnia was 8.3% and the prevalence of adolescents with symptoms of insomnia without daytime impairment (disturbed sleepers) was 13.1%. HRQoL was significantly reduced among adolescents with insomnia compared to normal sleepers (p<0.001) and even when compared to disturbed sleepers (p<0.001). There was an increase in daytime sleepiness from normal sleepers to disturbed sleepers and to adolescents with insomnia (p<0.001). There was also an increase in the prevalence and severity of depressive symptoms (p<0.001). CONCLUSIONS: Our results show that insomnia is associated with a significantly lower health related quality of life among adolescents.

Prevalence and risk factors for insomnia among Portuguese adolescents.

UNLABELLED: Epidemiologic studies have shown that insomnia is the most prevalent sleep disorder at all ages, associated with sociodemographic and environmental factors and lifestyle. The aim of this study was to quantify the prevalence of insomnia and analyze its determinants among Portuguese adolescents. In a cross-sectional study, we evaluated 6,919 students from the 7th to the 12th grade from 26 secondary schools, during 2012. Data were collected using a self-administered questionnaire. Insomnia was defined based on the Diagnostic and Statistical Manual of Mental Disorders IV criteria. Prevalences were expressed in proportions with 95 % confidence intervals (CI), and the magnitude of association between variables was detailed using odds ratio (OR). The prevalence of symptoms of insomnia was 21.4 %, and the prevalence of insomnia was 8.3 %. After adjustment for gender and age, insomnia was associated with female gender (adjusted OR = 1.82; CI 95 %: 1.56-2.13), age ≥ 16 years (adjusted OR = 1.17; CI 95 %: 1.01-1.35), coffee and alcohol consumption (adjusted OR = 1.40; CI 95 %: 1.20-1.63 and adjusted OR = 1.21; CI 95 %: 1.03-1.41, respectively), and depressive symptoms (adjusted OR = 3.59; CI 95 %: 3.04-4.24). CONCLUSIONS: The high prevalence of insomnia in our sample of Portuguese adolescents confirms findings from epidemiologic studies that have shown insomnia to affect from 4.4 to 13.4 % of adolescents. The main risk factors for insomnia among these adolescents are gender (female), age (≥ 16 years), depression, and coffee and alcohol consumption, which is also in concordance with those in the literature.