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
−4.0
−4.3
−4.7
Standard error of measurement
−3.2
−3.3
−3.1