HSRT - Health Sciences Reasoning Quantitative Clinical Reasoning Questions and Answers

Question 1

A clinical trial for a new antihypertensive drug reports that the treatment group (n=200) had a mean systolic blood pressure reduction of 15 mmHg, while the placebo group (n=200) had a mean reduction of 5 mmHg.
The p-value for the difference between the groups was p < 0.01.
Which of the following is the most accurate interpretation of the p-value?

Accepted Answer

The observed difference in blood pressure reduction between the two groups is statistically significant.

Answer

There is a greater than 99% probability that the new drug is effective.

Answer

The study proves that the drug is clinically superior to the placebo.

Answer

There is less than a 1% chance that the study results are wrong.

Question 2

A patient is prescribed a medication at a dose of 250 mg to be taken orally twice a day. The medication is available in a liquid suspension with a concentration of 125 mg/5 mL. How many milliliters (mL) should the patient take for each dose?

Accepted Answer

10 mL

Answer

5 mL

Answer

15 mL

Answer

20 mL

Question 3

In a screening test for a certain disease, the sensitivity is 95% and the specificity is 90%. Which of the following statements is the best interpretation of this information?

Accepted Answer

The test correctly identifies 90% of all patients who do not have the disease.

Answer

The test will be positive in 95% of the entire population.

Answer

If a patient tests positive, there is a 95% chance they have the disease.

Answer

90% of patients with the disease will test positive.

Question 4

A hospital unit tracks the number of patient falls per 1,000 patient-days. In January, there were 4 falls and 2,000 patient-days. In February, there were 6 falls and 2,500 patient-days. What is the fall rate per 1,000 patient-days for February?

Accepted Answer

2.4 falls

Answer

2.0 falls

Answer

6.0 falls

Answer

0.0024 falls

Question 5

A study is conducted to evaluate the effectiveness of a new physical therapy program. The results show that the average patient increases their range of motion by 15 degrees, with a 95% confidence interval of degrees. What is the most appropriate conclusion from this data?

Accepted Answer

We are 95% confident that the true average improvement in range of motion for the population is between 12 and 18 degrees.

Answer

The study is inconclusive because the confidence interval is too wide.

Answer

All patients in the program will improve their range of motion by at least 12 degrees.

Answer

The study is flawed because the average improvement is not exactly in the middle of the interval.

Question 6

A patient's lab results show a white blood cell (WBC) count of 12.5 x 10^3/μL. The normal reference range for WBC is 4.5 to 11.0 x 10^3/μL. Based on this quantitative data, the patient's WBC count is best described as:

Accepted Answer

Slightly above the normal range.

Answer

Within the normal range.

Answer

Significantly below the normal range.

Answer

Critically low.