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Analyzing Symptom Management Trials: The Value of Both Intention-to-Treat and Per-Protocol Approaches

Barbara A. Given

Charles Given

Alla Sikorskii

Mei You

Ruth McCorkle

Victoria L. Champion
symptom assessment, symptom management
ONF 2009, 36(6), E293-E302. DOI: 10.1188/09.ONF.E293-E302

Purpose/Objectives: Two analytical approaches are described for a randomized trial testing interventions for symptom management.

Design: To compare an intention-to-treat with a perprotocol approach.

Setting: Patients were accrued from six cancer centers.

Sample: 94 men and 140 women with solid tumors were accrued.

Methods: An intention-to-treat approach (as randomized) and per-protocol analyses (at least one symptom reaching threshold and one follow-up intervention) were compared. The analysis determines how each approach affects results. A two-arm, six-contact, eight-week trial was implemented. In one arm, nurses followed a cognitive behavioral protocol. In the second arm, a non-nurse coach referred patients to a symptom management guide.

Main Research Variables: Trial arm; summed severity scores; interference-based severity categories at intake, 10 weeks, and 16 weeks; site; and stage of cancer.

Findings: Each arm produced a reduction in severity at 10 and 16 weeks with no differences between arms. In the per-protocol analyses, symptoms reported at the first contact required more time to resolve. Older patients exposed to the nurse arm resolved in fewer contacts.

Conclusions: The intention-to-treat analyses indicated that both arms were successful but offered few insights into how symptoms or patients influenced severity. Per-protocol analyses (intervention and dose), when, and which strategies affected symptoms.

Implications for Nursing: Each analytical strategy serves a purpose. Intention-to-treat defines the success of a trial. Per-protocol analyses allow nurses to pose clinical questions about response and dose of the intervention. Nurses should participate in analyses of interventions to understand the conditions where interventions are successful.

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