Multiple regression analyses for the association of foot VPT (natural log transformed) with lead exposure indices and potential confounders in a group of workers exposed to lead long term (all models were adjusted for sex, body height, smoking, and alcohol)
| Independent variables | Model 1 β (SE) | Model 2 β (SE) | Model 3 β (SE) | Model 4 β (SE) | Model 5 β (SE) | Model 6 β (SE) |
| Current PbB (μg/dl) | 0.0047 (0.0033) | |||||
| Max PbB (μg/dl) | 0.0053 (0.0029) | |||||
| Mean PbB (μg/dl) | 0.0074 (0.0035)4-150 | |||||
| ICL (year4-150μg/dl) | −0.0001 (0.0001) | |||||
| TWICL (μg/dl) | 0.0099 (0.0047)4-150 | |||||
| Life span in the work (%) | −0.3742 (0.2746) | |||||
| Age (y) | 0.0275 (0.0054)4-160 | 0.0271 (0.0054)4-160 | 0.0270 (0.0054)4-160 | 0.0283 (0.0057)4-160 | 0.0280 (0.0054)4-160 | 0.0279 (0.0054)4-160 |