Irritable bowel syndrome defined by factor analysis. Gender and race comparisons

Area of Science:

• Gastroenterology and internal medicine

Background:

• Irritable bowel syndrome (IBS) diagnosis relies on symptom criteria.
• The Manning criteria are commonly used but their cross-subgroup applicability is debated.

Purpose of the Study:

• To assess the validity of the Manning criteria across different demographic subgroups.
• To identify core symptoms indicative of irritable bowel syndrome.

Main Methods:

• A 22-item symptom questionnaire was administered to a diverse adult population (N=1344).
• Principal components factor analysis with varimax rotation was employed to identify symptom clusters.

Main Results:

• Three specific Manning symptoms (loose stools, increased bowel movement frequency with pain onset, pain relief with defecation) formed a consistent cluster across all subgroups.
• These three symptoms demonstrated applicability across genders and ethnicities (African-American and Caucasian).
• Three other Manning symptoms showed minimal correlation with the core cluster, suggesting limited diagnostic utility.

Conclusions:

• The three core Manning symptoms are reliable for diagnosing irritable bowel syndrome (IBS) across diverse populations.
• These core symptoms, when used with clinical evaluation, support IBS diagnosis.
• Certain Manning symptoms may not be useful for IBS diagnosis and require further validation.