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