Formulae for the estimation of the accurate orotracheal ETT insertion depth in children
| Authors, year | Study cohort, n, range | Target age group | Formula (cm) |
| Morgan and Steward, 198218
| 50, 3–16 years | All ages | Height (cm)×0.1+5 |
| All ages | Weight (kg)÷5+12 | ||
| PALS guidelines, 20009 | No information available | >1 year | Age (years)÷2+12 |
| Lau et al, 20066 | 85, 1 –15 years | >1 year | Age (years)÷2+13 |
| Lee et al, 20188 | 813, 1–15 years | >1 year | Height (cm)×0.1+3 |
PALS, Paediatric Advanced Life Support.