A researcher is interested in the relationship between leisure time

A researcher is interested in the relationship between leisure time
physical activity, diet, extracurricular activities and hours of sleep with cardiovascular fitness in children ages 6 through 12. She will recruit 100 children to participate in the study. Cardiovascular fitness will be assessed via a 6-minute walk test. Leisure time physical activity, diet, extracurricular activities and hours of sleep will be assessed through questionnaires completed by their parents.

what type of variable is cardiovascular fitness in this question?
interval
nominal
ratio

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