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Table 4 Distribution - based method to determine the minimal important difference of the PFSDQ-M

From: The minimal important difference of the pulmonary functional status and dyspnea questionnaire in patients with severe chronic obstructive pulmonary disease

Distribution based method

MID of PFSDQ-M

Cohen’s effect size

 

Activity

−3.6

Dyspnea

−3.7

Fatigue

−3.5

Empirical rule effect size

 

Activity

−4.0

Dyspnea

−4.3

Fatigue

−4.7

Standard error of measurement

 

Activity

−3.2

Dyspnea

−3.3

Fatigue

−3.1

  1. MID minimal important difference, PFSDQ-M pulmonary functional status and dyspnea questionnaire modified version.