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Letter to the Editor

To the Editor:We read with great interest the study by Pang and Ying,1 which revealed measurement of the length of the Achilles tendon. In our opinion, some parts of this study are not clear enough. Altered dimensions and architectural abnormalities of the Achilles tendon were reported in cases with familial hyperlipidemia in previous reports.2,3 However, Pang and Ying1 did not identify familial hyperlipidemia as an exclusion criterion. The authors reported statistical significance of comparisons according to age and dominance of ankles and correlation between body height and thickness, cross-sectional area, and length of the Achilles tendon as either P < .05 or P > .05 in the “Results” sections of the abstract and full text.1 However, the P value of statistical significance was not identified in the statistical analysis section. In “Results,” a low correlation was reported between body height and thickness, cross-sectional area, and length of the Achilles tendon with relatively small correlation coefficients ranging from 0.07 to 0.28 and P > .05. The definition of “low correlation” is not feasible, solely with small correlation coefficients, in the absence of a statistically significant P value (mostly P < .05). We hope that the above-mentioned comments may further strengthen the findings of this study.