caption: <PERSON> plots illustrating the agreement between days 1--2 and days 2--3 measurements for neck flexion (A and B), neck extension (C and <PERSON>), right lateral flexion (E and F), and left lateral flexion (G and H). Agreement between the measurements is plotted as mean values (abscissa) against difference between the measurements (ordinate). The solid horizontal lines illustrate the mean difference and limits of agreement (mean difference ± 1.96 SD).
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