Senthilselvan A, et al. - In this cross-sectional study involving 9,059 patients (aged 30 years and above), researchers used data from the first three cycles of the Canadian Health Measures Survey to describe asthma and chronic obstructive pulmonary disease (COPD) overlap syndrome [ACOS] in the Canadian population. Participants in the study were categorized into control, ACOS, COPD only and asthma only groups based on the self-report. Data reported that the prevalence of ACOS group was estimated to be 1.59%, of COPD and asthma groups were 2.21% and 6.65%, respectively. The ACOS group showed the highest proportion of wheeze whereas the COPD group had the highest prevalence of shortness of breath. The proportion of females in the ACOS group was significantly higher than males. The ACOS group vs COPD, asthma and control groups had a greater prevalence of heart disease, cancer, arthritis and liver disease. Overall, ACOS had similar characteristics in the Canadian population compared with the developed countries.