TRAJECTORIES OF SLEEP COMPLAINTS FROM EARLY MID-LIFE TO OLD AGE
Trajectories of Sleep Complaints From Early Midlife to Old Age: Longitudinal Modeling Study
Paula Salo, PhD1,2; Jussi Vahtera, MD, PhD1,3; Jane E. Ferrie, PhD4,5; Tasnime Akbaraly, PhD4,6; Marcel Goldberg, MD, PhD7,8; Marie Zins, PhD7,8; Jaana Pentti, BSc1; Marianna Virtanen, PhD1; Martin J. Shipley, MSc4; Archana Singh-Manoux, PhD4,7; Yves Dauvilliers, MD, PhD9; Mika Kivimaki, PhD1,4
1Finnish Institute of Occupational Health, Helsinki, Finland; 2Department of Psychology, University of Turku, Turku, Finland; 3Department of Public Health, University of Turku and Turku University Hospital, Turku, Finland; 4Department of Epidemiology and Public Health, University College London Medical School, London, United Kingdom; 5School of Community and Social Medicine, University of Bristol, Bristol, United Kingdom; 6INSERM U1061, Montpellier, France; University Montpellier I, Montpellier, France; 7INSERM, U1018, Centre for Research in Epidemiology and Population Health, France; 8Versailles-Saint Quentin University, Versailles, France; 9Department of Neurology, Hôpital Gui de Chauliac, INSERM U1061, Montpellier, France
To estimate trajectories of sleep lost over worry as a function of age, using longitudinal modeling, and compare these trajectories with those for insomnia symptoms.
Design and Setting:
Data from two prospective, occupational cohorts (the Whitehall II and Finnish Public Sector studies) comprising 84,384 observations from four to eight repeat measurements in 1985-2010.
There were 16,408 men and women age 34-79 yr.
Measurements and Results:
Age-related trajectories of sleep lost over worry and insomnia symptoms (sleep initiation or maintenance problems, nonrefreshing sleep) were estimated using repeated-measures log-binomial regression analysis and generalized estimating equations. These analyses were adjusted for year of birth and time of measurement to minimize confounding by cohort or period effects. The prevalence ratio for insomnia symptoms was higher in older age groups compared with participants age 34-45 yr. In contrast, the age-related trajectory of sleep lost over worry included two phases: a period of high prevalence of sleep complaints at age 34-60 yr followed by a declining trajectory at older ages. Compared with participants age 34-45 yr, prevalence ratios for sleep lost over worry were 0.63 (0.49-0.80) and 0.59 (0.41-0.84) in the Whitehall II study participants ages 61-65 and 71-79 years. Corresponding figures were 0.62 (0.52-0.75) and 0.46 (0.32-0.66) in the Finnish Public Sector study.
This study shows a general age-related decrease in sleep lost over worry between late midlife and old age, a pattern strikingly different from the age-related increase in insomnia symptoms.
Salo P; Vahtera J; Ferrie JE; Akbaraly T; Goldberg M; Zins M; Pentti J; Virtanen M; Shipley MJ; Singh-Manoux A; Dauvilliers Y; Kivimaki M. Trajectories of sleep complaints from early midlife to old age: longitudinal modeling study. SLEEP 2012;35(11):1559-1568.