Correlation of age and the diameter of the cervical nerve roots C5 and C6 during the first 2 years of life analyzed by high-resolution ultrasound imaging.

The test showed highly significant correlations for all four locations (C6‐r: tau = 0.52, p < 10 −7 ; C6‐l: tau = 0.52, p < 10 −7 ; C5‐r: tau = 0.53, p < 10 −7 ; C5‐l: tau = 0.50, p < 10 −6 ), confirming a statistically significant increase in the diameter with age for all four locations.

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