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NHIS data. The top plot shows the estimates (points) and 95% intervals (bars) of the effects of relative BMI. The numbers (1–10) on the x-axis represent the levels of BMI, with lower (higher) levels representing lower (higher) BMI. The bottom plot shows the estimated splines (black curve) and 95% pointwise confidence intervals (shaded region) of absolute BMI. The tick marks on the x-axis indicate the observed values of BMI.
