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Table 5 Within-patient change threshold analyses: Mean change from baseline by anchor-based methods for E-RS Total and domain scores and wheeze item

From: Reliability, validity and responsiveness of E-RS:COPD in patients with spirometric asthma-COPD overlap

Item

Subgroup

Mean change from baseline to final weeka (SD)

RS-Total

Global impression of change: slightly better (n = 129)

−1.4 (3.4)

Global impression of change: slightly worse (n = 14)

0.2 (3.7)

SGRQ improvement: decrease 4 to 5 points (n = 8)

−2.7 (3.4)

SGRQ deterioration: increase 4 to 5 points (n = 11)

−1.4 (2.9)

RS-Cough and Sputum

Global impression of change: slightly better (n = 129)

−0.3 (1.2)

Global impression of change: slightly worse (n = 14)

0.0 (1.4)

SGRQ improvement: decrease 4 to 5 points (n = 8)

−0.7 (0.6)

SGRQ deterioration: increase 4 to 5 points (n = 11)

0.3 (0.6)

RS-Chest Symptoms

Global impression of change: slightly better (n = 129)

−0.4 (1.1)

Global impression of change: slightly worse (n = 14)

0.5 (1.4)

SGRQ improvement: decrease 4 to 5 points (n = 8)

−0.8 (1.4)

SGRQ deterioration: increase 4 to 5 points (n = 11)

−0.6 (1.2)

RS-Breathlessness

Global impression of change: slightly better (n = 129)

−0.7 (1.6)

Global impression of change: slightly worse (n = 14)

−0.3 (1.4)

SGRQ improvement: decrease 4 to 5 points (n = 8)

−1.2 (1.6)

SGRQ deterioration: increase 4 to 5 points (n = 11)

−0.5 (1.4)

Wheeze

Global impression of change: slightly better (n = 129)

−0.1 (0.5)

Global impression of change: slightly worse (n = 14)

−0.1 (0.6)

SGRQ improvement: decrease 4 to 5 points (n = 8)

−0.2 (0.6)

SGRQ deterioration: increase 4 to 5 points (n = 11)

−0.2 (0.5)

  1. aThe baseline week was defined as the last week of run-in (Day −7 to Day −1). The final week was defined as the final week of the 4-week treatment period (Day 21 to Day 28)
  2. E-RS Evaluating Respiratory Symptoms in chronic obstructive pulmonary disease, SD standard deviation, SGRQ St George’s Respiratory Questionnaire