A study is planned to compare the blood pressure lowering effect of two medications (drug A and B) in patients with elevated systolic blood pressure. Drug A is a newly developed medication lowering the elevated SBP and drug B is a commonly prescribed medication for high SBP. 80 newly diagnosed patients with high SBP are recruited into the study with half of them randomly assigned to drug A and another half to drug B for 3 months. Each participants blood pressure will be monitored during the study, but the change in SBP (mmhg) will be recorded as the difference between SBP measured at the end of the study and SBP measured on entering the study.
A) What type of study is this?- Experimental(RTC)?
b)How many factorz (variables) are involved in this study and what are they?- I said 3 Drug A's effectiveness, Drug Bs effectiveness, and Systolic Bp?
c) Wat are the measurement scales for these factors (variables)?- I said nominal for both drugs, and ratio
2
An investigator reviewed 700 singleton birth records from the past 5 years at the Hospital. A total of 56 records were identified as low birth weight (birth weight less then 2500 mg). She also identified another 56 infants whose birth weight was higher then 2500mg, but who were born the same day and matched with the same gender as in the low birth weight. Each infants mother was interviewed to determine whether cigarette smoking exposure was associated with fetal birth weight.
A)What type of study?- I said case control
b)How many factors (variables) are involved in this study? What are they?- Birth weight, smoking, gender, date of of birth,
c)What are the measurement scales for these factors?-ratio, nominal, nominal, ratio? (in order of the 4 factors listed above)
Really appreciate any help
A) The study described is an experimental study because participants are randomly assigned to different treatments (drug A or drug B) in order to compare their effectiveness.
B) There are three variables involved in this study. The first variable is the treatment being administered (drug A or drug B). The second variable is the effectiveness of drug A, and the third variable is the effectiveness of drug B.
C) The measurement scale for the treatment variable (drug A and drug B) is nominal, meaning that they are categorical variables with no inherent order. The measurement scale for the effectiveness variables would depend on the specific measurement used to record the change in systolic blood pressure. If the change is measured on a continuous scale (e.g., in millimeters of mercury, mmHg), then the scale would be ratio. However, if the change is categorized into groups (e.g., low, medium, and high effectiveness), then the scale would be ordinal.
A) The study described is a case-control study because it involves comparing individuals with a certain characteristic (low birth weight) to individuals without that characteristic (normal birth weight) in order to investigate the association with cigarette smoking exposure.
B) There are four variables involved in this study. The first variable is birth weight (low or normal). The second variable is smoking exposure (exposed or unexposed). The third variable is gender (male or female). The fourth variable is the date of birth.
C) The measurement scale for the birth weight variable would be ratio scale because birth weight is measured on a continuous scale (in milligrams). The measurement scale for the smoking exposure variable would be nominal because it is a categorical variable with no inherent order. The measurement scale for the gender variable would also be nominal. The measurement scale for the date of birth variable would depend on how it is recorded. If it is recorded as a continuous variable (e.g., with the exact date), then it would be ratio scale. If it is recorded as categories (e.g., by month or year), then it would be ordinal or nominal scale, respectively.