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Table 3 Linear regression models for 3 distances with age under 3 different surgical positions

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

Distances, cmPositions
Head-back positionMiddle head positionMaximal flexion of the head
CT, cmCT = 3.236 + 0.298 × ageCT = 2.443 + 0.256 × ageCT = 1.650 + 0.236 × age
CV, cmCV = 8.362 + 0.403 × ageCV = 7.647 + 0.377 × ageCV = 6.902 + 0.364 × age
TV, cmTV = 5.125 + 0.105 × ageTV = 5.291 + 0.111 × ageTV = 5.252 + 0.129 × age
  Position changes 
 Middle head position to be Head-back position Middle head position to be Maximal flexion of the head
CT, cmCT = 2.290 + 0.277 × age* + 1.099 × Position change* CT = 2.520 + 0.246 × age*-0.947 × Position change *
CV, cmCV = 7.550 + 0.390 × age* + 0.909 × Position change * CV = 7.693 + 0.370 × age*-0.838 × Position change *
TV, cmTV = 5.312 + 0.108 × age*-0.208 × Position change TV = 5.226 + 0.120 × age* + 0.90 × Position change
  1. *P-value for regression coefficients < 0.05