TABLE 5.
IBDSI-SF Scale | # Items | α | Total IBD Sample 1 | CD Sample 1 | UC Sample 1 | F, CD vs UC | r with I | r with II | r with III | Test-retest reliability (over 2 weeks) | Test-retest reliability (over 2 months) |
---|---|---|---|---|---|---|---|---|---|---|---|
Mean (SD), Min-Max | Mean (SD), Min-Max | Mean (SD), Min-Max | Sample 2 | Sample 2 | Sample 2 | Sample 2 | Sample 2 | ||||
N = 264 | n = 140 | n = 124 | N = 154 | N = 154 | N = 154 | N = 152 | N = 147 | ||||
Total Score | 24 | 0.92 | 15.3 (13.3) | 16.6 (12.5) | 13.8 (14.0) | 2.98 | 0.81 | 0.88 | 0.75 | r = 0.83 | r = 0.74 |
0–67.0 | 0–60.0 | 0–67.0 | P < 0.10 | P < 0.001 | P < 0.001 | P < 0.001 | P < 0.001 | P < 0.001 | |||
I. Bowel Symptoms a | 9 | 0.85 | 0.7 (0.7) | 0.7 (0.7) | 0.7 (0.8) | 0.18 | — | r = 0.88 | r = 0.78 | ||
0–3.6 | 0–2.8 | 0–3.6 | P > 0.10 | P < 0.001 | P < 0.001 | ||||||
II. Abdominal & Bodily Discomfortb | 12 | 0.87 | 0.6 (0.6) | 0.6 (0.6) | 0.5 (0.5) | 7.10 | .46 | — | r = 0.79 | r = 0.71 | |
0–2.8 | 0–2.7 | 0–2.8 | P < 0.01 | P < 0.001 | P < 0.001 | P < 0.001 | |||||
III. Fatigue | 3 | 0.82 | 1.1 (0.9) | 1.2 (0.9) | 1.0 (0.9) | 1.65 | .44 | .62 | — | r = 0.71 | r = 0.56 |
0–3.7 | 0–3.3 | 0–3.7 | P > 0.05 | P < 0.001 | P < 0.001 | P < 0.001 | P < 0.001 |
Note. The total score is calculated as a sum of the coded items. Subscale scores are calculated as the average of items on that scale. aIncludes item 35 reporting on fistula activity, which in the long form is part of the Bowel Complications subscale. bIncludes item 28 reporting on arthralgia/arthritis, which in the long form is part of the Systemic Complications subscale. r = Pearson correlations.