Evaluate the collective function of references cited together in a given text segment.
Classify their combined role into one of the following categories: 'method', 'background', or 'result'.

Text:Health-related literacy was measured using the reading component of the STOFHLA.(7) The test generally requires 7 minutes to administer and is intended to determine participants‚Äô ability to read and understand written health-related passages with readability levels of 4.
Category: