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Table 1 Comparison of individual parameters in males and females

From: Radiographic analysis of the sacral-2-alar screw trajectory

  Male (n = 48) Female (n = 52)
Left Right P Left Right P
Length of the screw trajectory (mm) 47.18 ± 3.91 45.46 ± 4.37  < 0.01 44.80 ± 3.66 44.01 ± 3.72 0.024
Sagittal angle (°) 29.06 ± 4.00 23.33 ± 4.26  < 0.01 32.14 ± 5.48 25.12 ± 5.19  < 0.01
Coronal angle (°) 13.31 ± 6.95 14.88 ± 6.84 0.014 16.04 ± 7.74 16.67 ± 8.34 0.337
Distance between the entry point and the spinous process (mm) 21.0 (3.7)a 22.8 (2.9)a 0.001b 21.8 (2.8)a 21.6 (2.7)a 0.004b
Minimum diameter of the screw trajectory (mm) 17.1 (2.3)a 16.9(3.1) 0.638b 17.1 (5)a 17(4.5)a 0.059b
  1. The Shapiro–Wilk test showed that the length of the nail track, the angle of the sagittal plane, and the angle of the coronal plane were all normally distributed (P > 0.05); the distance between the nail entry point and the spinous process and the minimum diameter of the nail path had a non-normal distribution
  2. athe median (quartile spacing), bthe Wilcoxon sign rank sum test