 ### Description

Griscom et al developed equations to describe the dimensions of the trachea in children with ages ranging from 0 up to 6 years of age. The authors are from Children's Hospital and Harvard Medical School in Boston.

Patient selection: 19 boys and 15 girls from 9 days to almost 6 years old

Parameters:

(1) gender

(2) body height in centimeters

Exponential equations using height and gender:

tracheal length in cm in boys =

= EXP(-1.13) * ((height in cm)^0.66)

tracheal length in cm in girls =

= EXP(-1.07) * ((height in cm)^0.65)

anteroposterior diameter in cm in boys =

= EXP(-3.87) * ((height in cm)^0.77)

anteroposterior diameter in cm in girls =

= EXP(-5.46) * ((height in cm)^1.13)

transverse diameter in cm in boys =

= EXP(-3.74) * ((height in cm)^0.77)

transverse diameter in cm in girls =

= EXP(-3.81) * ((height in cm)^0.79)

cross-sectional area in square cm in boys =

= EXP(-7.34) * ((height in cm)^1.43)

cross-sectional area in square cm in girls =

= EXP(-9.09) * ((height in cm)^1.83)

volume in cubic cm in boys =

= EXP(-8.48) * ((height in cm)^2.10)

volume in cubic cm in girls =

= EXP(-10.14) * ((height in cm)^2.48)

Linear equations using height as variable:

tracheal length in cm =

= (0.050 * (height in cm)) + 1.78

tracheal anteroposterior diameter in cm =

= (0.0070 * (height in cm)) + 0.05

tracheal transverse diameter in cm =

= (0.0065 * (height in cm)) + 0.18