Abstract:
BACKGROUND:Controversy exists on how to measure patient-reported outcomes in irritable bowel syndrome (IBS) clinical trials effectively. Pain numeric rating scales (NRS) are widely used in the non-IBS pain literature. The Food and Drug Administration has proposed using the NRS in IBS. AIM:To test the psychometrics of an abdominal pain NRS in IBS. Methods We analysed data from a longitudinal cohort of Rome III IBS subjects. At entry, subjects completed a 10-point NRS, bowel symptoms, IBS severity measurements (IBS-SSS, FBDSI), health-related quality of life indices (IBS-QOL, EQ5D), and the Worker Productivity Activity Index (WPAI). We repeated assessments at 3 months along with a response scale to calculate the minimal clinically important difference. RESULTS:There were 277 subjects (82% women; age = 42 +/- 15) at baseline and 90 at 3 months. The NRS correlated cross-sectionally with IBS-SSS (r = 0.60; P < 0.0011), FBDSI (r = 0.49; P < 0.0001), IBS-QOL (r = 0.43; P < 0.0001), EQ5D (r = 0.48; P < 0.0001), presenteeism (r = 0.39; P < 0.0001), absenteeism (r = 0.17; P = 0.04) and distension (r = 0.46; P < 0.0001), but not stool frequency or form. The minimal clinically important difference was 2.2 points, correlating with a 29.5% reduction over time. CONCLUSIONS:An abdominal pain NRS exhibits excellent validity and can be readily interpreted with a minimal clinically important difference in patients with IBS. These data support the use of the NRS in IBS clinical trials.
journal_name
Aliment Pharmacol Therjournal_title
Alimentary pharmacology & therapeuticsauthors
Spiegel B,Bolus R,Harris LA,Lucak S,Naliboff B,Esrailian E,Chey WD,Lembo A,Karsan H,Tillisch K,Talley J,Mayer E,Chang Ldoi
10.1111/j.1365-2036.2009.04144.xsubject
Has Abstractpub_date
2009-12-01 00:00:00pages
1159-70issue
11-12eissn
0269-2813issn
1365-2036pii
APT4144journal_volume
30pub_type
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