Question

Which of the following selected variables, associated with clinical trials of a drug, are quantitative variables? CHECK ALL THAT APPLY.(A) Dosage form - 1=tablet, 2=capsule, 3=liquid solution, 4=other(B) Age (in years) - <<20, 20-30, 30-40, 40-50, 50-60, 60 or above(C) Smoking history (cigarettes per year)(D) Body mass index (kg/m2kg/m2)(E) Gender - Male, Female

Answer 1

Quantitative variables in a clinical drug trial context are those that can be quantified with numbers, including age, smoking history, and BMI, but not dosage form or gender.

Step-by-step explanation:

In a clinical trial setting, quantitative variables are those that can be measured and represented with numbers. Among the options presented, the following are quantitative variables:

• (B) Age (in years) - This is a quantitative variable because it can be measured numerically, even though the groups are binned into ranges.
• (C) Smoking history (cigarettes per year) - This is a quantitative variable as it quantifies the amount of cigarette consumption.
• (D) Body mass index (BMI) (kg/m2) - BMI is a quantitative variable because it is a calculated value representing the weight-to-height ratio.

The other options, such as (A) dosage form and (E) gender, are not quantitative. The dosage form uses numbers to represent categories, making it nominal, and gender is a categorical variable.

Answer 2

The correct options are:

C) Smoking history (cigarettes per year) is correct.

D) Body mass index (kg/m2kg/m2) is correct.

Step-by-step explanation:

Consider the provided information.

The value of quantitative Variables can be determined by counting or measuring something.

The value of qualitative Variables can't be determined by counting or measuring something.

Now consider the provided options:

Option A) Dosage form - 1=tablet, 2=capsule, 3=liquid solution, 4=other

This is not a quantitative Variables, because we can't determined the value by counting the measuring.

Option B) Age (in years) - <<20, 20-30, 30-40, 40-50, 50-60, 60 or above

This is not a quantitative Variables

Option C) Smoking history (cigarettes per year)

We can count the number of cigarettes per year so it is a quantitative Variables.

Thus, the option C) Smoking history (cigarettes per year) is correct.

Option D) Body mass index (kg/m2kg/m2)

We can count the Body mass index as it is a numerical value.

Thus, the option D) Body mass index (kg/m2kg/m2) is correct.

Option E) Gender - Male, Female

This is not a quantitative Variables, because we can't determined the value by counting the measuring.