Chapter 17 Quiz

The independent variable in an analysis is the outcome.

False

Which of the following terms is used in connection with intensity of exercise and refers to the ratio of metabolic rate during exercise to the rate while resting?

MET

A type of study that matches individuals with and without disease on factors such as age and ethnicity is the

case-control study

A study design uses, for example, two groups of people representing a disease-free population who are then classified as exercisers and nonexercisers. After a period of time, the mortality rates of each group are compared. This design is called a(n)

cohort study

Additional factors that can affect the relationship between physical activity and blood cholesterol, such as smoking, body fat, and so on, are called

confounding factors

A variable in an epidemiological study that is tested for its relationship with the outcome of interest.

exposure

Of the surveys frequently used for measuring physical activity in epidemiologic research, the shortest (one to four items) is the

global questionnaire

The major weakness of epidemiologic studies is

inability to experimentally establish cause and effect

Prevalence of disease differs from incidence of disease in that prevalence refers to the number of

people who presently have a disease, whereas incidence relates to new cases

Determinants of disease are often called

risk factors