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Table 3 Concurrent validity of the IDEEL with the SF-36, EQ-5D and Dry Eye Questionnaire (Pearson coefficient correlations)

From: Development and validation of the impact of dry eye on everyday life (IDEEL) questionnaire, a patient-reported outcomes (PRO) measure for the assessment of the burden of dry eye on patients

Questionnaires Modules of the IDEEL
  Dry Eye Symptom-Bother* Dry Eye Impact on Daily Life Dry Eye Treatment Satisfaction
   Impact on Daily Activities* Emotional Impact due to Dry Eye* Impact on Work due to Dry Eye* Satisfaction with Treatment Effectiveness* Treatment-related Bother/
Inconvenience*
Short Form-36
Physical Functioning -0.33 0.30 0.35 0.04 0.06 0.35
Role Physical -0.35 0.30 0.36 0.24 0.15 0.37
Bodily Pain -0.39 0.34 0.39 0.22 0.14 0.31
Vitality Index -0.36 0.34 0.40 0.31 0.24 0.38
General Health Perceptions -0.38 0.32 0.45 0.18 0.17 0.40
Social Functioning -0.31 0.31 0.40 0.27 0.11 0.35
Role Emotional -0.27 0.29 0.33 0.20 0.12 0.29
Mental Health Index -0.32 0.33 0.40 0.13 0.30 0.27
Physical Component Scale -0.37 0.31 0.38 0.16 0.09 0.37
Mental Component Scale -0.26 0.29 0.36 0.23 0.23 0.26
EuroQol-5D
EQ-5D Quality of Life Score -0.36 0.31 0.35 0.24 0.23 0.30
EQ-5D VAS Health Thermometer -0.34 0.30 0.35 0.22 0.09 0.22
Dry Eye Questionnaire
All items (correlation min; correlation max) 0.21; 0.83 -0.19; -0.65 -0.11; -0.69 -0.07; -0.68 -0.05; -0.48 -0.06; -0.60
  1. * Number of patients ranging from 203 to 209 for Dry Eye Symptom-Bother, Impact on Daily Activities and Emotional Impact due to Dry Eye; ranging from 130 to 131 for Impact on Work due to Dry Eye; ranging from 131 to 137 for Satisfaction with Treatment Effectiveness; ranging form 148 to 154 for Treatment -Related Bother/Inconvenience
  2. Bold font correlations are the highest correlations between the IDEEL scales and the SF-36 or EQ-5D scales.