Question

Scenario 4: The Nurses’ Health Study is one of the largest prospective investigations of risk factors for major chronic diseases in women. Using data from food frequency questionnaires and mortality records collected between 1986-2010, researchers examined the association between long term gluten intake (GLUT) and development of coronary heart disease (CHD). The results indicated that consumption of foods containing gluten was not significantly associated with risk of CHD, even after adjusting for race, body mass index (BMI), and other known risk factors. Coding for study variables: • GLUT—gluten intake; 1 = lowest; 2 = low; 3 = medium; 4 = high; 5 = highest • RACE – 1 = White; 2 = Black; 3 = other • BMI – body mass index (kg/m2) • CHD —coronary heart disease; 1 = yes; 2 = no -Continued next page- Question Type answer below Score (to be entered by instructor 12. What study design was used in this scenario? 13. What type of variable is GLUT?   14. What type of variable is RACE? 15. What type of variable is BMI? 16. What type of variable is CHD?

Answer 1

Answer:

12) The study design used here is "Prospective Study"

( A prospective study (sometimes called a prospective cohort study) is a type of cohort study, or group study, where participants are enrolled into the study before they develop the disease )

13) The variable GLUT is the "ordinal" type of variable.

( here in study there are different categories ordered as lowest><ow<medium<high<highest )

14) The RACE is "categorical" variable . i.e Multiple categories like white, black, other.

15) BMI is continuous variable taking numeric values.

16) CHD is "Binary" variable as it taking only two values as 1 for yes and 2 for no.

NOTE: here in this study we can say that the CHD is the response variable. and all other are auxiliary or predictor variables