Table 7– Estimates of minimally important differences (MIDs) for Capacity of Daily Living during the Morning (CDLM) and Global Chest Symptoms Questionnaire (GCSQ) scores using anchor- and distribution-based approaches
Subjects nAnchor-based approachDistribution-based approaches
SGRQ-C (sem)#SEM0.5 sd+
CDLM questonnaire
Study 14690.15 (0.01)0.190.40
Study 23160.22 (0.02)0.280.42
GCSQ
Study 15780.13 (0.01)0.270.32
Study 24180.12 (0.02)0.220.44
  • SGRQ-C: St George's Respiratory Questionnaire for chronic obstructive pulmonary disease patients; SEM: standard error of measurement. #: MID = 4; : MID = sd×square root (1–α); +: MID = 0.5×sd.