Fig. 2.

Adjusted ORs for (A) short sleep duration and (B) long sleep duration by mental health conditions and physical illness, excluding individuals with insomnia symptoms. Each solid square represents an odds ratio (OR), and the size of the squares is inversely proportional to the variance of the log OR in that group after considering the variance of the log risk in the reference group where appropriate. The horizontal lines represent the 95% CI. All ORs were stratified by age, gender and region and adjusted for BMI, smoking, alcohol, MET-h/day and systolic blood pressure (SBP). Prior disease was defined as having been diagnosed by a doctor with at least one of the following diseases: diabetes, coronary heart disease, stroke or TIA, hypertension, rheumatic heart disease, tuberculosis, emphysema/bronchitis, asthma, cirrhosis/hepatitis, peptic ulcer, gallbladder disease, kidney disease, rheumatoid arthritis, head injury and cancer.