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. 2020 Feb 4;64(2):103–108. doi: 10.4103/ija.IJA_619_19

Table 2.

Correlation between age-based ETT (formula 1, 2) OD and US-measured subglottic diameter with final ETT OD

Parameter R2 P
Formula-1-based OD 0.6 <0.001
Formula-2-based OD 0.7 <0.001
US-measured-subglottic diameter-based OD 0.7 <0.001
Age 0.7 <0.001
Height 0.3 <0.001
Weight 0.4 <0.001

ETT – Endotracheal tube; OD – Outer diameter; US – Ultrasound