Fig. 2 | Scientific Reports

Fig. 2

From: Nonlinear association between sleep duration and thyroid hormone levels in patients with thyroid cancer

Fig. 2

Nonlinear dose–response relationship between sleep duration and thyroid hormones. Locally weighted scatterplot smoothing (LOESS) curves with 95% confidence intervals demonstrate the nonlinear association between sleep duration and serum thyroid hormones (TSH, T3, T4). Both short (≤ 6 h) and long (≥ 9 h) sleep durations correspond to altered hormone levels, with an inflection point near 7 h indicating a U-shaped pattern.

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