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Table 1 Measurements 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

 Neutral
(n = 150)
Flexion
(n = 150)
Extension
(n = 150)
Group difference
(P value)
OC4D (mm)69.0 ± 6.968.9 ± 6.868.1 ± 6.90.302
OCD (mm)23.0 ± 4.827.6 ± 6.013.8 ± 4.7F > N > E (P <  0.05)
  1. Values represent the mean ± standard deviation
  2. OC4D Occiput-C4 distance, OCD Occipitocervical distance