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Table 1 Measurements in T1 stratified by side of screw placement and patient’s sexa

From: Ideal T1 laminar screw fixation based on computed tomography morphometry

Measurements Total Male Female t P Left Right t P
L (mm) 32.8 ± 3.2 34.8 ± 2.8 30.7 ± 2.1 9.405 P < 0.05 32.6 ± 3.3 33.0 ± 3.3 -1.971 P > 0.05
W (mm) 7.4 ± 1.3 8.1 ± 1.2 6.7 ± .1.1 6.811 P < 0.05 7.4 ± 1.3 7.4 ± 1.3 -0.128 P > 0.05
Ws (mm) 4.4 ± 0.9 4.8 ± 0.9 3.8 ± 0.6 7.101 P < 0.05 4.3 ± 0.9 4.4 ± 0.9 -1.772 P > 0.05
A (°) 48.6 ± 3.5 47.2 ± 3.2 50.1 ± 3.2 -5.044 P < 0.05 48.7 ± 3.2 48.5 ± 3.9 0.243 P > 0.05
T (mm) 10.8 ± 2.1 11.9 ± 2.0 9.6 ± 1.5 7.452 P < 0.05 10.7 ± 2.2 10.8 ± 2.0 -0.276 P > 0.05
MT (mm) 10.1 ± 2.3 11.3 ± 2.2 8.8 ± 1.5 7.293 P < 0.05 9.9 ± 2.3 10.2 ± 2.2 -0.572 P > 0.05
Ts (mm) 6.1 ± 1.6 6.6 ± 1.7 5.5 ± 1.3 3.772 P < 0.05 6.0 ± 1.6 6.1 ± 1.7 -0.998 P > 0.05
MTs (mm) 5.8 ± 1.7 6.3 ± 1.8 5.2 ± 1.3 3.961 P < 0.05 5.6 ± 1.6 5.9 ± 1.7 -1.399 P > 0.05
H (mm) 13.5 ± 1.4 14.0 ± 1.3 12.8 ± 1.2 5.184 P < 0.05 13.4 ± 1.4 13.5 ± 1.4 -1.447 P > 0.05
MH (mm) 13.6 ± 1.6 14.1 ± 1.5 13.0 ± 1.4 4.222 P < 0.05 13.6 ± 1.6 13.6 ± 1.6 -1.616 P > 0.05
  1. aThe laminar screw length (L), the minimal outer cortical width (W), the minimal cancellous width (Ws), the minimal outer cortical height (T, MT), the minimal cancellous height (Ts, MTs), the axis angle (A) and the spinous process height (H, MH) in T1 are reported as \( \overset{-}{\mathrm{X}} \) ±S. T, Ts, and H were measured in the sagittal reconstruction, while the MT, MTs, and MH were measured in the modified sagittal reconstruction.