Table 4

Age categories of ≥ 50% of study participants

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

Wilczynski et al. BMC Medical Informatics and Decision Making 2005 5:20   doi:10.1186/1472-6947-5-20