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. 2023 Mar 6;13(5):997. doi: 10.3390/diagnostics13050997

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© 2023 by the authors.

Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).

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The relationships between the adjusted eight lip characteristics and BMI. The solid blue line fitted by the Loess function reveals the true variation tendency of lip characteristics according to the BMI, and the grey dashed lines fitted by the lm function reveal the general trend. NLA: Nasolabial angle, SSD: Superior sulcus depth, BULT: Basic upper lip thickness, ULT: Upper lip thickness, ULL: Upper lip length, SPT: Soft pogonion thickness, ISD: Inferior sulcus depth, LLL: Lower lip length, BMI: Body mass index.