Study Objectives: To examine the comorbidity between insomnia and medical conditions. Methods: This cross-sectional study was conducted in community adults, aged ≥ 60 years, who resided in one of four major cities in northern China. Sociodemographic and clinical data were collected simultaneously. A total of 3,176 elderly adults (1,292 male, mean ± standard deviation age 70.2 ± 6.8 years; 1,884 female, 68.8 ± 6.7 years) were interviewed. Results: The prevalence of specific medical conditions in both people with insomnia and people without insomnia was detected. Significantly higher proportions of arrhythmia, hypertension, cerebral hemorrhage, migraine, and hyperlipidemia were observed in people with insomnia than in people without insomnia. Moreover, a significantly higher proportion of insomnia was seen in elderly people with arrhythmia and migraine. We also found that elderly people with insomnia who took sleep medications reported a higher prevalence of coexisting arrhythmia, hypertension, and migraine, even after adjusting for age, sex, and depression. Conclusions: Our results indicate associations between insomnia and medical conditions in the community elderly in China. People who complained of insomnia had poorer physical health conditions. Sleep medication may not be a covariate that influences the comorbidity of some specific physical conditions.
I NTRO DUCTI O NInsomnia is a serious public health concern, with 46% to 69% of patients presenting to a primary care office to report complaints of insomnia.1,2 A total of 46% to 69% of patients who complain of insomnia have comorbid medical or psychiatric disorders.3-5 Insomnia has a significant negative effect on morbidity and mortality, particularly in the elderly.6,7 Crosssectional studies have attempted to determine whether people with insomnia report more health problems. [8][9][10] However, very little prevalence data have been reported, and some of the samples that have been used may limit generalizability. Taylor et al. performed a study with 772 subjects (aged 20-98 years) and found significant overlap between insomnia and multiple medical conditions. 4 In another cross-sectional study, researchers collected data from 9,000 older adults (aged ≥ 65 years) and found that a lifetime history of insomnia was associated with greater difficulties in daily activities, respiratory symptoms, and having two or more health problems (ie, hypertension, heart disease, cancer, stroke, diabetes, hip fracture, and other fractures). 10 The latter finding was further confirmed by the same research group who elucidated the association between insomnia and heart disease, stroke, hip fracture, and respiratory symptoms. 11 A meta-analysis found a high prevalence of sleep complaints with comorbid physical disorders in a large population of older adults from low-and middle-income countries.
SCIENTIFIC INVESTIGATIONS
Insomnia and Multimorbidity in the Community Elderly in China12 One underlying mechanism may be inflammation that is strongly linked to cardiovascular disease, 1...