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Table 2 Gender differences of the OC4D and OCD in neutral, flexion, and extension positions

From: A novel method for measurement of the occipital-cervical distance via the occiput-C4 distance

 Male
(n = 73)
Female
(n = 77)
P value
OC4D (mm)
 Neutral73.0 ± 6.465.1 ± 4.8<  0.001
 Flexion72.0 ± 6.664.4 ± 4.9<  0.001
 Extension72.9 ± 6.365.1 ± 4.9<  0.001
OCD (mm)
 Neutral22.4 ± 5.023.6 ± 4.7> 0.05
 Flexion26.4 ± 4.728.8 ± 7.0> 0.05
 Extension13.1 ± 4.614.5 ± 4.7> 0.05
  1. Values represent the mean ± standard deviation
  2. OC4D Occiput-C4 distance, OCD Occipitocervical distance