연간 외래 방문 횟수는 심각한 악화 (10.8±5.0)가 없는 환자 (7.5±4.3)보다 높았다.
The annual number of outpatient department visits was higher in patients with severe exacerbations (10.8±5.0) than without severe exacerbations (7.5±4.3).