Table 1 Multivariate weighted linear models for the relationship between serum cotinine and PTH.

From: Association between tobacco smoke exposure and serum parathyroid hormone levels among US adults (NHANES 2003–2006)

Ln-cotinine(ng/dL)

Model 1

Model 2

Model 3

Continuous

−0.85 (−0.99, −0.70) < 0.001*

−0.61 (−0.76, −0.47) < 0.001*

−0.58 (−0.72, −0.45) < 0.001*

Categories

 Quartile 1

Reference

Reference

Reference

 Quartile 2

0.00 (−1.65, 1.65) 0.9961

0.16 (−1.46, 1.77) 0.8488

0.12 (−1.31, 1.55) 0.8701

 Quartile 3

−1.53 (−3.20, 0.15) 0.0744

−0.57 (−2.24, 1.10) 0.5060

−1.11 (−2.62, 0.40) 0.1485

 Quartile 4

−7.57 (−9.19, −5.95) < 0.001*

−5.26 (−6.90, −3.63) < 0.001*

−5.28 (−6.81, −3.76) < 0.001*

  1. Model 1: No adjustment; Model 2: Adjustments based on age, gender, and race; Model 3: Adjust according to age, gender, race, BMI, family PIR, education, diabetes, hypertension, alcohol use, 25 (OH) D3, serum albumin, serum ALP, serum corrected calcium, cholesterol, triglyceride, serum creatinine, eGFR, serum glucose, serum phosphorus, urinary albumin, and urinary creatinine. Perform logarithmic conversion on cotinine.
  2. *p < 0.05.
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