In a randomized study comparing TENS plus heat and exercises vs heat and exercises alone, TENS represents which variable?

In a randomized study comparing TENS plus heat and exercises vs heat and exercises alone, TENS represents which variable?

• A. continuous variable
• B. dependent variable
• C. discrete variable
• D. independent variable

Answer: (D)

The key idea is that the independent variable is the factor the researchers deliberately change to see its effect on the outcome. In this study, one group receives TENS in addition to heat and exercises while the other group receives heat and exercises without TENS. TENS is the condition that is being manipulated to assess its impact, so it serves as the independent variable. The outcomes you measure—such as pain relief or functional scores—are the dependent variable. The terms continuous or discrete describe data types of measurements, not the role of the intervention itself, and the presence or absence of TENS is a dichotomous condition, reinforcing its place as the independent variable.

The key idea is that the independent variable is the factor the researchers deliberately change to see its effect on the outcome. In this study, one group receives TENS in addition to heat and exercises while the other group receives heat and exercises without TENS. TENS is the condition that is being manipulated to assess its impact, so it serves as the independent variable. The outcomes you measure—such as pain relief or functional scores—are the dependent variable. The terms continuous or discrete describe data types of measurements, not the role of the intervention itself, and the presence or absence of TENS is a dichotomous condition, reinforcing its place as the independent variable.