insomnia in older adults with chronic obstructive pulmonary disease copd in hong kong a casecontrol study this study aimed to determine the frequency and sociodemographicclinical correlates of insomnia in chinese patients aged 60 years suffering from chronic obstructive pulmonary disease copd in this casecontrol study of 142 outpatients with copd and 218 sex and agematched control subjects copd patients were recruited from a prospective study sample hospitalized in hong kong for acute copd exacerbation 2 major copd symptoms or 1 majorminor copd symptoms for 2 consecutive days controls were recruited from social centres in hong kong activity of daily living was assessed with the instrumental activities of daily living scale life events were evaluated using the life event scale depressive symptoms were ascertained with the geriatric depression scale and quality of life was measured using the medical outcomes study short form12 early middle and late insomnia were measured using items 4 5 and 6 of the hamilton rating scale for depression the frequency of 1 type of insomnia was 472 in patients and 257 in controls frequencies of early middle and late insomnia in patients were 246 310 and 261 respectively compared to 147 147 and 119 in controls group differences were nonsignificant after controlling for relevant covariates however in multiple logistic regression analysis more physical illnesses p 002 or 13 95 ci 1117 and more severe depressive symptoms p 0009 or 11 95 ci 10313 were independently associated with any type of insomnia in copd patients accounting for 213 of the variance a significant proportion of older adult chinese copd patients suffer from insomnia that warrants more attention in clinical practice