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Table 3 The association of asthma duration with WWI and BMI (kg/m2)

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

Model 1

β, (95% CI)

Model 2

β, (95% CI)

Model 3

β, (95% CI)

WWI

0.003 (0.002, 0.004)

0.021 (0.019, 0.022)

0.016 (0.015, 0.017)

Quartiles of asthma duration (years)

 Q1 (0–9)

Reference

Reference

Reference

 Q2 (10–19)

− 0.048 (− 0.097, 0.001)

0.157 (0.110, 0.204)

0.122 (0.078, 0.166)

 Q3 (20–38)

− 0.126 (− 0.173, − 0.079)

0.337 (0.286, 0.388)

0.270 (0.222, 0.319)

 Q4 (39–79)

0.125 (0.077, 0.172)

0.868 (0.808, 0.928)

0.641 (0.580, 0.702)

P for trend

 < 0.01

 < 0.01

 < 0.01

BMI (kg/m2)

− 0.006 (− 0.016, 0.003)

− 0.031 (− 0.045, − 0.018)

− 0.098 (− 0.112, − 0.085)

Quartiles of asthma duration (years)

 Q1 (0–9)

Reference

Reference

Reference

 Q2 (10–19)

− 0.994 (− 1.516, − 0.472)

− 1.252 (− 1.786, − 0.719)

− 1.626 (− 2.121, − 1.130)

 Q3 (20–38)

− 0.434 (− 0.934, 0.067) 0.08929

− 1.315 (− 1.896, − 0.735)

− 2.160 (− 2.706, − 1.613)

 Q4 (39–79)

− 0.501 (− 1.008, 0.006)

− 1.794 (− 2.482, − 1.106)

− 4.705 (− 5.393, − 4.017)

P for trend

 < 0.01

 < 0.01

 < 0.01

  1. Model 1 = no covariates were adjusted. Model 2 = Model 1 + gender, race were adjusted. Model 3 = Model 2 + asthma onset age, education level, PIR, smoking, alcohol, physical activity intensity, hypertension, diabetes, prescription medications, energy, sugars, fat, cholesterol, moisture were adjusted