Dependent variable | |||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|

HEMA in urine 2 | HEMA in urine 3 | ||||||||||||||

HEMA (μg/g creatinine) | P | HEMA (μg/L) | P | HEMA (μg/g creatinine) | P | HEMA (μg/L) | P | ||||||||

Sample size | 31 | 31 | 25 | 25 | |||||||||||

Exposure (whole shift) | 6.51 | 0.0005 | 5.75 | 0.008 | 0.63 | 0.8 | 2.12 | 0.2 | |||||||

HEMA in urine 1 | 0.45 | 0.06 | 0.64 | 0.02 | NI | NI | |||||||||

HEMA in urine 2 | NI | NI | 0.48 | 0.04 | 0.30 | 0.08 | |||||||||

Cigarettes/d (number) | −0.003 | 0.8 | −0.02 | 0.1 | 0.006 | 0.5 | 0.006 | 0.5 | |||||||

Adjusted R^{2} | 0.32 | 0.23 | 0.20 | 0.16 | |||||||||||

Pr > F | 0.004 | 0.02 | 0.05 | 0.09 |

NOTE: All subjects had detectable HEMA concentrations in both urine samples used in each regression equation (urine 1 and 2 or urine 2 and 3). Dependent variable is HEMA either in urine 2 (end of shift) or in urine 3 (next morning). HEMA concentrations in every model are consistently expressed with the same units (microgram per liter or microgram per gram creatinine, respectively). With respect to the other variables, the following codes or units were used: exposure (ppm) and smoking (number of cigarettes per day). Figures indicate partial regression coefficients and corresponding significance levels. Pr > F: statistical significance of the

*R*^{2}.