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Table 4 Threshold effect analysis for the association of asthma duration with BMI (kg/m2) and WWI

From: The association of asthma duration with body mass index and Weight-Adjusted-Waist index in a nationwide study of the U.S. adults

Outcomes

BMI (kg/m2)

WWI

Linear effect model

 β, (95%CI)

− 0.10 (− 0.11, − 0.08)

0.02 (0.01, 0.02)

Non-linear model

 Inflection point (K)

3

2

 β, (95%CI) (< K)

0.41 (0.11, 0.71)

0.09 (0.05, 0.14)

 β, (95%CI) (≥ K)

− 0.10 (− 0.12, − 0.09)

0.02 (0.01, 0.02)

 LLR

 < 0.001

 < 0.001

  1. *Gender, race, asthma onset age, education level, PIR, smoking, alcohol, physical activity intensity, hypertension, diabetes, prescription medications, energy, sugars, fat, cholesterol, moisture were adjusted in the models. LLR: Log-likelihood ratio; K: Inflection point.