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Table 4 Minimal clinical important differences (MCID) of TRACK according to anchor-based and distribution-based approaches

From: Test for Respiratory and Asthma Control in Kids (TRACK): validation of the Portuguese version

  Mean difference in TRACK scores Effect size
Medical opinion
 Well vs partially controlled 15.6 0.69
 Partially vs not controlled 24.6 1.1
GINA classification
 Well vs partially controlled 15.7 0.69
 Partially vs not controlled 20.6 0.91
ED visit in the last month
 Yes vs no 20.7 0.92
Medical opinion at follow-up (N = 195)
 Better/worse (1 level) 9.3 0.41
Baseline (N = 299) – 0.5 SD 11.3
Follow-up (N = 195) – 0.5 SD 10.7
Baseline (N = 299) – 1 SEM 12.4
Follow-up (N = 195) – 1 SEM 11.7
  1. ED emergency department; SD standard deviation; SEM standard error of the mean