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Table 1 Characteristics of the study populationa

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

Characteristic Knee rOA (n= 1635)b Knee sxOA (n= 1605)b
Mean whole blood Pbc, μg/dl (±SD) 2.4 (2.5) 2.4 (2.5)
Mean age, yr (±SD) 65.3 (11.0) 65.2 (11.0)
Mean BMI, kg/m2 (±SD) 31.2 (7.1) 31.2 (7.1)
African-Americans, n (%) 582 (35.6%) 573 (35.7%)
Women, n (%) 1085 (66.4%) 1069 (66.6%)
Current smoker, n (%) 259 (16.5%) 257 (16.6%)
Current drinker, n (%) 333 (21.2%) 329 (21.2%)
Knee outcomes rOA sxOA
   Present, n (%) 659 (40.3%) 384 (23.9%)
   Bilateral, n (%) 377 (23.1%) 170 (10.6%)
   Moderate to severe, n (%) 426 (26.1%) 271 (16.9%)
  1. arOA, radiographic osteoarthritis; sxOA, symptomatic osteoarthritis; SD, standard deviation; Pb, lead; BMI, body mass index; bsamples with complete data for knee rOA and knee sxOA, respectively; cmedian, 1.8 μg/dl (range, 0.3 to 42.0 μg/dl).