Background:The longitudinal associations between psychological dysfunction (PD) and asthma exacerbations (AE) have not been adequately addressed. This study aimed to systematically assess the influence of PD on AE, and to determine whether different PD affects AE differentially.
P<0.001], presenting as hospitalizations (RR adj =1.22, 95% CI: 1.12-1.34, P<0.001), unscheduled doctor visits (RR =4.26, 95% CI: 2.52-7.19), and emergency department (ED) visits (RR adj =1.06, 95% CI: 1.01-1.10, P=0.009) because of asthma. Depression significantly increased the risk of AE (RR adj =1.07, 95% CI: 1.04-1.11, P<0.001), presenting as hospitalizations (RR adj =1.26, 95% CI: 1.07-1.49, P=0.007) and ED visits (RR adj =1.06, 95% CI: 1.02-1.11, P=0.007) because of asthma. Anxiety was only associated with an increased risk of AE in pregnant women (RR =1.05, 95% CI: 1.01-1.08), possibly due to the small amount of data available on anxiety. The influence of PD on AE was only significant when the PD exposure time exceeded one year.Conclusions: Co-morbid PD adversely affects AE, and there are differential effects of depression and anxiety. Asthmatic subjects with PD may benefit from more attention when establishing a treatment regimen in clinical practice.