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Understanding Experimental Design in Treating Lifestyle Effects on Health Outcomes

This document explores various experimental designs illustrated by figures that help clarify treatment effects in health-related studies. We detail how confounding factors, such as drinking habits versus overall diet and lifestyle, can obscure results. The designs include randomized comparative experiments comparing online and classroom instruction, a completely randomized design for assessing energy-saving programs, and a block design addressing different advertisement strategies among male and female subjects, showcasing how structure impacts study outcomes.

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Understanding Experimental Design in Treating Lifestyle Effects on Health Outcomes

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  1. Figure 9.1 Confounding: we can’t distinguish the effects of drinking habits from the effects of overall diet and lifestyle.

  2. Figure 9.2 The treatments in the experimental design of Example 9.3. Combinations of values of the two factors form six treatments.

  3. Figure 9.3 Outline of a randomized comparative experiment to compare online and classroom instruction, for Example 9.5.

  4. Figure 9.4 Outline of a completely randomized design comparing three energy-saving programs, for Example 9.6.

  5. Figure 9.5 Outline of a block design, for Example 9.10. The blocks consist of male and female subjects. Thetreatments are three advertisements for the same product.

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