Table 3.
Concurrent validity of the IDEEL with the SF-36, EQ-5D and Dry Eye Questionnaire (Pearson coefficient correlations)
| 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 |
* 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
Bold font correlations are the highest correlations between the IDEEL scales and the SF-36 or EQ-5D scales.