Minimum and maximum scores and Cronbach’s alpha coefficient for the UCLA GIT 2.0 (GERD), PROMIS (GERD), QOLRAD, and Reflux Disease Questionnaire at baseline.
| Scale | Hypothetical Range for Each Scale | Min Score for This Cohort* | Max Score for This Cohort* | % with Min Score | % with Max Score | Cronbach’s α⋄ |
|---|---|---|---|---|---|---|
| UCLA GIT 2.0* Reflux, n = 113 | 0.0–3.0 | 0.0 | 2.6 | 0.9 | 0.0 | 0.78 |
| PROMIS Reflux*, n = 65 | 30.3–87.6 | 36.4† | 68.8† | 0.0 | 0.0 | 0.82 |
| QOLRAD**, n = 110 | ||||||
| Emotional distress | 1.0–7.0 | 1.7 | 7.0 | 0.0 | 0.9 | 0.95 |
| Sleep disturbance | 1.0–7.0 | 1.0 | 7.0 | 0.9 | 0.9 | 0.96 |
| FD problems | 1.0–7.0 | 1.5 | 7.0 | 0.0 | 0.9 | 0.93 |
| PS function | 1.0–7.0 | 2.0 | 7.0 | 0.0 | 0.9 | 0.91 |
| Vitality | 1.0–7.0 | 1.3 | 7.0 | 0.0 | 0.9 | 0.93 |
↵* Higher score denotes more GI symptoms;
↵** Lower score denotes more GI symptoms;
↵† Based on T score, so the min/max score for the cohort is different from the min/max score for the instrument.
↵⋄ Cronbach’s alpha reported to 2 decimal places as is standard reporting methodology. UCLA: University of California, Los Angeles; GIT: GI Tract; GERD: gastroesophageal reflux disease; PROMIS: Patient-Reported Outcome Measurement Information System; QOLRAD: Quality of Life in Reflux and Dyspepsia; FD: food and drink domain; PS: physical/social functioning.