15th February 2024

Researchers are looking for new methods to determine a patient’s frailty.

Researchers are looking for new methods to determine a patient’s frailty. A new scoring system that ranks the patient’s upper arm circumference into five discrete categories has been established. The researchers are attempting to establish the correlation between the new test scores and the patient’s time to mobilise 10 meters in a standardised setting. A scatterplot of the dataset suggests a non-linear monotonic relationship between the two variables.

Which of the following tests is most appropriate to answer the research question?