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Table 3 Mean and range of MCID estimates for SGRQ-I and K-BILD domains based on change in anchors from baseline to 12 months

From: Responsiveness and minimal clinically important difference of SGRQ-I and K-BILD in idiopathic pulmonary fibrosis

Domains

Improvement

Deterioration

Mean

Range

Mean

Range

SGRQ-I total

3.9

0.7–5.5

4.9

1.3–7.6

SGRQ-I Symptoms

9.0

7.3–13.5

8.1

7.2–10.3

SGRQ-I Activities

9.8

9.6–10.0

10.4

9.6–10.9

SGRQ-I Impacts

5.4

2.1–8.8

5.4

4.0–8.4

K-BILD Total

4.7

2.0–5.0

2.7

2.0–3.0

K-BILD Psychological

4.8

2.0–6.0

3.5

1.0–7.0

K-BILD Breathlessness and activities

3.6

0.0–6.0

3.6

2.0–6.0

K-BILD Chest symptoms

7.0

4.0–10.0

6.0

3.0–9.0

  1. MCID Minimal clinically important difference, SGRQ-I IPF-specific version of the Saint George’s Respiratory Questionnaire, K-BILD King’s Brief Interstitial Lung Disease questionnaire