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Table 2 Mean ln-transformed Pb levels by covariate status (n = 1,669a)

From: Whole blood lead levels are associated with radiographic and symptomatic knee osteoarthritis: a cross-sectional analysis in the Johnston County Osteoarthritis Project

Characteristics and strata

Mean ln Pb (±SD)

P valueb

Race

 

<0.001

   African-American

0.86 (0.70)

 

   Caucasian

0.51 (0.54)

 

Sex

 

<0.001

   Women

0.52 (0.56)

 

   Men

0.85 (0.68)

 

BMI

 

<0.001

   >30

0.58 (0.59)

 

   ≤30

0.68 (0.65)

 

Current smoking

 

0.006

   No

0.57 (0.59)

 

   Yes

0.97 (0.67)

 

Current drinking

 

<0.001

   No

0.56 (0.58)

 

   Yes

0.91 (0.70)

 

Knee rOA

 

0.1

   No

0.64 (0.64)

 

   Yes

0.63 (0.60)

 

Knee sxOA

 

0.1

   No

0.65 (0.64)

 

   Yes

0.60 (0.60)

 
  1. aFor rOA, n = 1,635; for sxOA, n = 1,605; for smoking, n = 1,605; for drinking, n = 1,606; ln Pb, natural log-transformed lead; SD, standard deviation; rOA, radiographic osteoarthritis; sxOA, symptomatic osteoarthritis; bP values represent differences in mean ln Pb values between strata for each characteristic.
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