인다카테롤이 COPD 환자에 대한 유지보수 치료로 승인되었기 때문에 '개선' 과 '유지' 모두 '효과적'으로 평가되었다.
Since indacaterol was approved as a maintenance treatment for COPD patients, both 'improved' and 'maintained' were assessed as being 'effective.'