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Table 1 Inclusion and exclusion criteria for screening of search results

From: Why are some people more fit than others? Correlates and determinants of cardiorespiratory fitness in adults: protocol for a systematic review

Inclusion criteria Exclusion criteria
• Primary results report on association (or lack of association) between one or more personal and/or interpersonal factor(s) and CRF
• CRF measured through maximal or submaximal ergometry test
• Results reported for adults (18–65 years) in the general population
• CRF considered as an exposure variable (rather than as an outcome variable) in the study design and analysis
• Study conducted in a highly selected population. Examples are:
− Patients with specific disorders or medical conditions (e.g. coronary artery disease, heart failure, schizophrenia, chronic obstructive pulmonary disease)
− Individuals categorized as obese
− Military personnel
− Professional athletes
• Randomized controlled trial or another type of quasi-experimental design where participants receive a fitness or exercise training intervention that increases CRF
• Qualitative study design (focus groups, open-ended interviews, and thematic reviews)
• Editorials, letters to the editor, or commentaries