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Validity and reliability of the Constipation Assessment Scale

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Randomized trial assesses the validity of the Constipation Assessment Scale in cancer patients, confirming its effectiveness for symptom evaluation.

The project aimed to evaluate the validity and reliability of the Constipation Assessment Scale (CAS) for patients undergoing specific treatments.
Sample included 32 working adults and 32 cancer patients at risk for constipation.
Participants completed the eight-item Constipation Assessment Scale (CAS).
Test-retest reliability was assessed by having 16 healthy adults complete the CAS twice with a 1-hour delay.
The CAS differentiated between symptom intensity in control (no constipation) and patient groups (significant t = 6.32, p < 0.0001).
Significant difference in symptom intensity between patients on morphine versus Vinca alkaloids (t = 2.54, p < 0.01).
High test-retest reliability with a correlation of r = 0.98.

McMillan et al. (1989) studied this question.

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Randomized trial assesses the validity of the Constipation Assessment Scale in cancer patients, confirming its effectiveness for symptom evaluation.