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Table 6 Longitudinal construct validity (Baseline – End of study) (Pearson correlation coefficients)

From: Modification of the asthma quality of life questionnaire (standardised) for patients 12 years and older

  Study 1
AQLQ12+ Age FEV1% pred PEF Asthma symptoms Night-time awakening Rescue medication use
Overall ≥ 18 yr 0.3 0.33 -0.43 -0.42 -0.39
  12–17 yr 0.06 0.29 -0.33 -0.2 -0.24
Symptoms ≥ 18 yr 0.32 0.34 -0.46 -0.46 -0.43
  12–17 yr 0.03 0.3 -0.33 -0.26 -0.25
Activity limitation ≥ 18 yr 0.27 0.28 -0.39 -0.37 -0.33
  12–17 yr 0.08 0.26 -0.33 -0.18 -0.21
Emotional function ≥ 18 yr 0.25 0.29 -0.3 -0.31 -0.33
  12–17 yr -0.06 0.12 -0.22 -0.11 -0.2
Environmental stimuli ≥ 18 yr 0.16 0.19 -0.25 -0.2 -0.2
  12–17 yr 0.19 0.3 -0.21 0 -0.16
  Study 2
AQLQ12+ Age FEV1% pred PEF Asthma symptoms Night-time awakening Rescue medication use
Overall ≥ 18 yr 0.21 0.41 -0.51 -0.41 -0.37
  12–17 yr 0.23 0.24 -0.45 -0.3 -0.2
Symptoms ≥ 18 yr 0.23 0.4 -0.56 -0.47 -0.43
  12–17 yr 0.26 0.29 -0.47 -0.31 -0.24
Activity limitation ≥ 18 yr 0.17 0.36 -0.43 -0.33 -0.3
  12–17 yr 0.23 0.15 -0.44 -0.28 -0.1
Emotional function ≥ 18 yr 0.14 0.33 -0.4 -0.28 -0.27
  12–17 yr 0.1 0.17 -0.21 -0.22 -0.23
Environmental stimuli ≥ 18 yr 0.17 0.36 -0.32 -0.28 -0.2
  12–17 yr 0.16 0.23 -0.48 -0.22 -0.15