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The constipation severity instrument: a validated measure.

Madhulika G Varma1, Jennifer Y Wang, Julia R Berian

  • 1Department of Surgery, University of California San Francisco, 2330 Post Street, Suite 260, San Francisco, California 94115, USA. varmam@surgery.ucsf.edu

Diseases of the Colon and Rectum
|January 4, 2008
PubMed
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The Constipation Severity Instrument is a reliable and valid tool for assessing constipation. This new instrument effectively measures severity and differentiates between various constipation subtypes.

Area of Science:

  • Gastroenterology
  • Clinical Assessment
  • Psychometrics

Background:

  • Constipation is a prevalent gastrointestinal disorder impacting quality of life.
  • Accurate assessment tools are crucial for effective diagnosis and management of constipation.

Purpose of the Study:

  • To develop and validate the Constipation Severity Instrument (CSI).
  • To evaluate the reliability and validity of the CSI for assessing constipation.

Main Methods:

  • Scale development involved literature review and focus groups, followed by administration to constipated patients and healthy volunteers.
  • Reliability was assessed using test-retest methods.
  • Validity was evaluated through content, convergent, divergent, and discriminant measures using established instruments and statistical analyses.

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Main Results:

  • Factor analysis identified three subscales: obstructive defecation, colonic inertia, and pain.
  • The CSI demonstrated high internal consistency (alpha=0.88-0.91) and test-retest reliability (ICC=0.84-0.91).
  • The instrument effectively discriminated between constipated patients and healthy controls, correlated well with existing measures, and showed inverse correlation with quality of life.

Conclusions:

  • The Constipation Severity Instrument is a reliable and valid measure for assessing patients with constipation.
  • Further validation in diverse constipated populations is recommended.