Qualitative data are measured by characteristics, often in descriptive terms, such as gender, race, genotype, and cancer stage. Images (such as CT scans, MRIs, and videos) and sounds (such as audio recordings) are also qualitative data.
National Institutes of Health (NIH) Office of Management: Common Data Types in Public Health Research
Rare Diseases Registry Program (RaDaR): Understand What Data Is
Qualitative research essentials for medical education [2018 published article]