Situation: A nurse at a Barangay Health Station (BHS) runs a monthly health teaching class for adults with hypertension, several of whom smoke. One year after the class, the nurse will do an outcome evaluation as defined in the PRECEDE-PROCEED model. Which measure should she use?

In the PRECEDE-PROCEED model, outcome evaluation measures health status and quality of life, such as blood pressure control, stroke, or mortality. Impact evaluation measures short-term change in the predisposing, enabling, and reinforcing factors and in behavior. Taking medicine and cooking without salt are behaviors and knowledge is a predisposing factor, so these are impact measures even when they are measured one year later.

In the PRECEDE-PROCEED model, evaluation is divided into three distinct levels, and confusing them is a common trap on licensure exams. The model moves from predisposing, enabling, and reinforcing factors, through behavior and environment, to the final health outcomes. The question asks specifically about outcome evaluation, which sits at the far end of that chain.

Outcome evaluation measures changes in health status and quality of life, not changes in knowledge, attitudes, or behavior. Blood pressure control is a direct health-status indicator. In contrast, knowledge is a predisposing factor, medication adherence and reduced salt use are behaviors, and all of these belong to impact evaluation, even when measured one year after the teaching.

The distinction is not about when you measure, but about what you measure. A knowledge test one year later still measures a predisposing factor. A pill count one year later still measures a behavior. Watch out! Do not let the one-year time frame trick you into choosing an impact measure as an outcome measure.

The PRECEDE-PROCEED model has been applied across chronic disease settings. In type 2 diabetes, meta-analytic evidence shows that interventions built on this model improve HbA1c, which is the diabetes equivalent of blood pressure control in hypertension—a true health outcome ^[1]. Cross-sectional work using the model also separates predisposing, enabling, and reinforcing factors from the final outcome of glycemic control, reinforcing the same logic: self-efficacy and self-management behaviors are upstream of the health-status endpoint ^[2].

Evaluation type	What it measures	Example from this question
Process evaluation	Implementation of the program itself	Number of classes held, attendance
Impact evaluation	Predisposing, enabling, reinforcing factors and behavior	Knowledge score, pill count, salt use on home visits
Outcome evaluation	Health status and quality of life	Blood pressure control, stroke, mortality

The same structure appears in other PRECEDE-PROCEED applications. A discharge-preparation program for colorectal cancer chemotherapy used the model to target knowledge and self-care ability as intermediate factors, with the expectation that these would later translate into better clinical outcomes . Similarly, a hemodialysis education program measured treatment compliance and healthy lifestyle behaviors as impact-level variables, while quality of life served as the outcome-level variable .

When a question asks for an outcome evaluation, look for the option that reflects a change in the disease state itself or in the person's overall well-being. Blood pressure control is the only option here that qualifies. The other three options—knowledge, medication adherence, and dietary behavior—are all legitimate targets of evaluation, but they are impact measures because they represent factors or behaviors that lead to the outcome, not the outcome itself.

Key point! Memorize the sequence: predisposing/enabling/reinforcing factors → behavior and environment → health status and quality of life. Impact evaluation covers the first two links; outcome evaluation covers the last link.