A subsequent restricted-cubic-spline (RCS) curve—reference 32% and knots at 17.9%, 28.3%, 36.1%, 46.2%—confirmed a highly significant non-linear association ( P for non-linearity < 0.001) and graphically illustrated the plateau beyond the breakpoint.
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Nonlinear relationship between body fat percentage and NAFLD mediated by METS-IR: threshold effects and subgroup differences.
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