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Table 2 Measured and calculated distances at 3 surgery positions in 172 children

From: Impact of changes in head position during head and neck surgery on the depth of tracheal tube intubation in anesthetized children

Distances, cm (mean ± SD)Head-back position (calculated by APLS formula)Middle head positionMaximal flexion of the headP-value for HB vs. MHP-value for MF vs. MH
CT, cm5.43 ± 1.464.33 ± 1.373.39 ± 1.35<  0.0001<  0.0001
CV, cm11.3 ± 1.4910.4 ± 1.479.59 ± 1.47<  0.0001<  0.0001
TV, cm5.90 ± 1.206.11 ± 1.256.20 ± 1.26<  0.00010.048