Table 2 Measured and calculated distances at 3 surgery positions in 172 children
Distances, cm (mean ± SD) | Head-back position (calculated by APLS formula) | Middle head position | Maximal flexion of the head | P-value for HB vs. MH | P-value for MF vs. MH |
|---|---|---|---|---|---|
CT, cm | 5.43 ± 1.46 | 4.33 ± 1.37 | 3.39 ± 1.35 | < 0.0001 | < 0.0001 |
CV, cm | 11.3 ± 1.49 | 10.4 ± 1.47 | 9.59 ± 1.47 | < 0.0001 | < 0.0001 |
TV, cm | 5.90 ± 1.20 | 6.11 ± 1.25 | 6.20 ± 1.26 | < 0.0001 | 0.048 |