Table 1

Characteristics of the study populationa

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%)


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).

Nelson et al. Arthritis Research & Therapy 2011 13:R37   doi:10.1186/ar3270

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