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Table 2 Study level probability of reaching a clinically meaningful reduction in SGRQ total score according to the magnitude of improvement in FEV1

From: Relationship between FEV1 change and patient-reported outcomes in randomised trials of inhaled bronchodilators for stable COPD: a systematic review

Improvement in FEV1(mL)

Number of study arms achieving SGRQ reduction, n/N (%)

 

4 units

3 units

≥40

17/35 (49)

21/35 (60)

≥60

14/25 (56)

18/25 (72)

≥80

12/17 (71)

14/17 (82)

≥100

12/15 (80)

14/15 (93)

≥120

8/10 (80)

9/10 (90)

  1. FEV1: forced expiratory volume in 1 second, SGRQ: St George's Respiratory Questionnaire