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Table 3 Threshold effect analysis of sleep duration and albumin using piece-wise linear regression

From: Association between sleep duration and albumin in US adults: a cross-sectional study of NHANES 2015–2018

Models β (95%CI) P value
Model I
  One line effect 0.04 (0.00, 0.08) 0.0366
Model II
  Inflection point (K) 7.5
    sleep duration \(<\) 7.5 0.30 (0.23, 0.38) \(<\) 0.0001
    sleep duration \(\ge\) 7.5 -0.18 (-0.25, -0.12) \(<\) 0.0001
    P for log-likelihood ratio test   \(<\) 0.001
  1. Model I, one-line linear regression; Model II, two-segment regression
  2. β was the effect size and the 95% CI indicated the confidence interval
  3. adjust for: sex, age, race, marital status, moderate work activity, TP, ALT, AST, Cr, UACR, HS-CRP, GLU, BMI, hypertension, high cholesterol, cancer or malignancy