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The mean age of the included asymptomatic topics ended up being 48.0 ± 8.4 years of age (range 20-69 years of age; 48.4 ± 10.2 years of age for men and 47.6 ± 6.4 years of age for females). The OC4D had been understood to be the shortest length from the center of the C4 vertebral human anatomy to the McGregor's line. Occipitocervical distances (OCDs) were calculated and reviewed its correlation with OC4Ds. Two spine surgeons each performed three measurements associated with OC4D