Short-term memory

What is the dependent and independent variable in the following article?

Perham, N., Howell, T., & Watt, A. (2022). Can a simple, short-term memory task help to screen

dyslexia? Current Psychology41(1), 360-368. https://doi-org/10.1007/s12144-019-00568-4

What is the relationship between short-term memory and long-term memory?
Short-term memory (or memory) refers to information processed in a short period of time. Long-term memory allows us to store information for long periods of time, including information that can be retrieved consciously (explicit memory) or unconsciously (implicit memory).