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Observational Study
Copyright: ©Author(s) 2026.
World J Diabetes. Apr 15, 2026; 17(4): 117489
Published online Apr 15, 2026. doi: 10.4239/wjd.v17.i4.117489
Figure 1
Figure 1 Smoothed curve from the fully adjusted linear model with restricted cubic splines. The shaded band indicates 95%CIs. The vertical line marks the estimated inflection (approximately 14.7 ng/mL). The outcome was modeled as FT3/FT4 × 100 for numerical scaling; inference is unaffected. 25(OH)D: 25-hydroxyvitamin D.