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Table 4 Age categories of ≥ 50% of study participants

From: An overview of the design and methods for retrieving high-quality studies for clinical care

Category Definition
Fetus Fetus
Newborn Birth to 1 month
Infant > 1 month to < 24 months
Preschool 2 years to < 6 years
Child 6 years to < 13 years
Adolescent 13 years to < 19 years
Adult 19 years to < 45 years
Middle age 45 years to < 65 years
Aged 65 years to < 80 years
Aged 80 ≥ 80 years
ND Age of study participants was non-discernible