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The comparations of multivariate regression analysis adjusted for eight lip characteristics among four BMI categories. 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. ns: p >= 0.05, *: p < 0.05, **: p < 0.01, ***: p < 0.001, ****: p < 0.0001.
