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Table 6 Inter- and intra-observer reliabilities of OC4Ds and OCDs

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

  OC4DOCDP value*
ICCStd error95% CIICCStd error95% CI
Neutral
 inter-observer reliability0.9450.1850.921–0.9650.7850.2540.689–0.814<  0.05
 intra-observer reliability0.9810.1240.941–0.9880.8320.2390.812–0.841<  0.05
Extension
 inter-observer reliability0.9530.1730.942–0.9710.6540.3120.638–0.664<  0.001
 intra-observer reliability0.9720.1420.953–0.9850.6710.3010.651–0.685<  0.001
Flexion
 inter-observer reliability0.9610.1560.948–0.9870.6810.2890.678–0.688<  0.05
 intra-observer reliability0.9680.1510.955–0.9890.6950.2620.684–0.715<  0.001
  1. OC4D Occiput-C4 distance, OCD Occipitocervical distance
  2. *Comparison of the ICC values between OC4D and OCD using the Z test