Table 2.

Measurement of subglottic diameter, mid-glottic and glottic transverse diameter at the age of 1–8 years (N = 95).

Age (years)	Subglottic diameter (mm)	Mid-glottic transverse diameter (mm)	Glottic transverse diameter (mm)	Outer ETT diameter (mm)	ETT size (mm ID)
1 (n = 7)	3.5 [3.1, 3.5]	2.8 [2.7, 2.9]	5.2 [4.9, 5.6]	6.2 [6.2, 6.2]	4.5 [4.5, 4.5]
2 (n = 20)	4.1 [3.6, 5.0]	3.0 [2.6, 3.4]	5.4 [5.0, 6.3]	6.2 [6.2, 6.8]	4.5 [4.5, 5.0]
3 (n = 14)	4.5 [4.2, 4.7]	3.4 [2.9, 3.6]	6.3 [5.1, 6.7]	6.8 [6.8, 7.5]	5.0 [5.0, 5.5]
4 (n = 12)	4.4 [4.0, 4.8]	3.3 [3.0, 3.5]	6.4 [5.7, 6.9]	7.5 [6.8, 7.5]	5.5 [5.0, 5.5]
5 (n = 15)	4.6 [4.3, 5.0]	3.5 [3.3, 4.0]	6.5 [6.0, 7.6]	7.5 [7.5, 8.2]	5.5 [5.5, 6.0]
6 (n = 14)	4.9 [4.5, 5.9]	3.6 [3.4, 3.7]	6.9 [6.5, 7.4]	7.8 [7.5, 8.2]	6.0 [5.5, 6.0]
7 (n = 6)	5.1 [4.8, 5.2]	3.6 [3.2, 4.4]	6.8 [6.3, 7.7]	7.8 [7.5, 8.2]	6.0 [5.5, 6.0]
8 (n = 7)	5.8 [5.2, 6.4]	3.9 [3.6, 4.0]	6.6 [6.4, 7.5]	8.8 [8.2, 8.8]	6.5 [6.0, 6.5]

Data presented as median [interquartile range].

ETT endotracheal tube.