Table 5.
Construct validity: Correlations between the IBD-Control summary scores and external measures of health status in patients with inflammatory bowel disease (IBD) at baseline assessment
| External measure | IBD-Control-8 | IBD-Control-VAS | ||||
|---|---|---|---|---|---|---|
| All | CD | UC | All | CD | UC | |
| UK-IBD-QoL score | 0.86 | 0.81 | 0.90 | 0.76 | 0.65 | 0.85 |
| EQ-5D utility score | 0.70 | 0.68 | 0.67 | 0.52 | 0.50 | 0.58 |
| EQ-5D VAS | 0.68 | 0.65 | 0.71 | 0.70 | 0.69 | 0.71 |
| Physician global assessment | −0.58 | −0.45 | −0.67 | −0.58 | −0.47 | −0.65 |
| Harvey-Bradshaw Index | n/a | −0.68 | n/a | n/a | −0.60 | n/a |
| Simple Clinical Colitis Activity Index | n/a | n/a | −0.72 | n/a | n/a | −0.75 |
Correlation expressed as Spearman's ρ values (p<0.01 in all cases).
CD, Crohn's disease; QoL, quality of life; UC, ulcerative colitis, VAS, visual analogue scale.