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Table 5 Multitrait-multimethod matrix between the EQ-5D-Y, the Pediatric Asthma Impact Scale and the Asthma Control Questionnaire

From: Measurement properties of the EQ-5D-Y administered through a smartphone app in children with asthma: a longitudinal questionnaire study

 

EQ-5D-Y

Utility index

EQ-VASc

Visual Analogue Scale

EQ-5D-Y

Dimension (Problems doing usual activities)

ACQd

Global Score

ACQ Item

(Limited in activities because of asthma)

PROMIS-PAIS Global Score

0.38a

n = 74

(p = .001)

CI [0.56 to 0.16]

0.16

n = 75

(p = .158)

CI [0.38 to 0.06]

0.33

n = 75

(p = .003)

CI [0.12 to 0.52]

0.37

n = 73

(p = .001)

CI [0.15 to 0.55]

0.29

n = 73

(p = .014)

CI [0.06 to 0.48]

PROMIS-PAISe Item

(Hard to play sports or exercise because of asthma)

0.25

n = 74

(p = .033)

CI [0.45 to 0.02]

0.16

n = 75

(p = .158)

CI [0.38 to 0.06]

0.17b

n = 75

(p = .151)

CI [ 0.06 to 0.38]

0.31

n = 73

(p = .008)

CI [0.08 to 0.50]

0.30

n = 73

(p = .011)

CI [0.07 to 0.49]

ACQ Global Score

0.28b

n = 113

(p = .002)

CI [0.44 to 0.10]

0.26

n = 116

(p = .004)

CI [0.43 to 0.09]

0.30

n = 115

(p = .001)

CI [0.12 to 0.46]

1

0.79

n = 116

(p = .000)

CI [0.71 to 0.85]

ACQ Item

(Limited in activities because of asthma)

0.36

n = 113

(p = .000)

CI [0.51 to 0.18]

0.26

n = 116

(p = .005)

CI [0.42 to 0.08]

0.35a

n = 115

(p = .000)

CI [0.18 to 0.50]

0.79

n = 116

(p = .000)

CI [0.71 to 0.85]

1

  1. Correlation coefficients are presented without a sign, since it only reflects that instruments’ scores are in the same or in the opposite direction
  2. aCorrelation hypothesized as moderate (0.31–0.60)
  3. bCorrelation hypothesized as weak (≤ 0.30)
  4. cEQ-VAS: EuroQol-Visual Analogue Scale
  5. dACQ: Asthma Control Questionnaire
  6. ePROMIS-PAIS: Patient-Reported Outcomes Measurement Information System-Pediatric Asthma Impact Scale