Match the following study designs Options A Randomized Trial

Match the following study designs:

Options:

A. Randomized Trial

B. Non-randomized Trial

C. Cohort Study

D. Case-Control Study

E. Cross-section Study

F. Ecological Study

a. Questionnaires are mailed to every tenth person listed in a city directory. Each person is asked to list his or her age, sex, occupation, socioeconomic status, smoking habits, and musculoskeletal symptoms. Musculoskeletal symptoms are compared in smokers and nonsmokers, controlling for age, sex, and socioeconomic status. ___

b. A sample of sedentary middle-aged men are selected from four census tracts. Each man is examined for coronary heart disease. Subjects having evidence of pre-existing coronary heart disease are excluded from further study. All others are assigned with a flip of a coin to either (a) a group that is coached to pursue regular moderate exercise or (b) a control group that gets a sham intervention. Subjects are then examined semiannually after the intervention to determine their cardiac health. ___

c. An investigator collects information on the size of manufacturing plants and their rates of accidents. She finds that the five largest plants have accident rates that are 50% higher than the five smallest plants. ___

Solution

A WILL GO WITH THE NON RAMDOMIZED TRAIL AS EVERY 10TH PERSON GIVEN THE QUESTIONAIRE AND ITS NOT CHOOSING THE RAMDON PERSON

B WILL GO WITH THE CROSS SECTIONAL STUDY AS THE CASE IS TAKEN FROM 4 DIFFERENT SAMPLE

C WILL GO WITH THE ECOLOGICAL STUDY AS THIS STUDY IS DEALING WITH THE PLANTS