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Table 2 Test–retest reliability of the urgency NRS

From: Psychometric evaluation of the Urgency NRS as a new patient-reported outcome measure for patients with ulcerative colitis

 

Stable on PGRSa

Stable on PGRCb

Urgency NRS score

  

n

642

202

Mean (SD)

  

Screening

6.1 (2.10)

–

Baseline

6.2 (2.16)

6.3 (2.29)

Week 4

–

6.0 (2.28)

p valuec

0.189

0.007

ICC(2,1) (95% CI)d

0.89 (0.87, 0.90)

0.76 (0.70, 0.82)

  1. CI confidence interval, ICC intraclass correlation coefficient, NRS Numeric Rating Scale, PGRC Patient Global Rating of Change, PGRS Patient Global Rating of Severity, SD standard deviation
  2. aParticipants recording the same PGRS score at screening and baseline
  3. bParticipants recording no change on the PGRC at week 4
  4. cPaired t test
  5. dICC(2,1) was calculated from a linear mixed-effects model with random intercepts using Urgency NRS scores from the two time points included in the analysis. A value ≥ 0.70 was considered evidence of acceptable test–retest reliability. Confidence intervals were constructed according to Cappelleri and Ting (2002)