Internal adjustment | External adjustment | |||||||
---|---|---|---|---|---|---|---|---|
Cumulative* | ln Cumulative | Cumulative | ln Cumulative | |||||
Coefficient† | p Value | Coefficient | p Value | Coefficient | p Value | Coefficient | p Value | |
Exposure unlagged | ||||||||
Including all exposure groups | ||||||||
Original data | 0.013 | 0.543 | 0.144 | 0.006 | 0.017 | 0.371 | 0.114 | 0.008 |
Revised cohort, mortality and employment data | −0.001 | 0.951 | 0.089 | 0.076 | −0.006 | 0.771 | 0.063 | 0.148 |
Inclusion of additional workers | −0.006 | 0.761 | 0.056 | 0.223 | −0.007 | 0.600 | 0.043 | 0.126 |
Excluding last exposure group | ||||||||
Original data | 0.204 | 0.001 | 0.230 | 0.001 | 0.180 | 0.002 | 0.180 | 0.001 |
Revised cohort, mortality and employment data | 0.172 | 0.003 | 0.175 | 0.004 | 0.161 | 0.003 | 0.167 | 0.004 |
Inclusion of additional workers | 0.149 | 0.007 | 0.126 | 0.021 | 0.142 | <0.001 | 0.124 | 0.007 |
Exposure lagged 15 years | ||||||||
Including last exposure group | ||||||||
Original data | 0.008 | 0.719 | 0.106 | 0.021 | 0.017 | 0.402 | 0.091 | 0.007 |
Revised cohort, mortality and employment data | −0.008 | 0.726 | 0.077 | 0.113 | −0.010 | 0.610 | 0.056 | 0.180 |
Inclusion of additional workers | −0.013 | 0.550 | 0.049 | 0.271 | −0.011 | 0.566 | 0.042 | 0.282 |
Excluding last exposure group | ||||||||
Original data | 0.204 | 0.002 | 0.170 | 0.001 | 0.190 | 0.001 | 0.144 | 0.001 |
Revised cohort, mortality and employment data | 0.159 | 0.009 | 0.160 | 0.007 | 0.153 | 0.005 | 0.159 | 0.004 |
Inclusion of additional workers | 0.136 | 0.018 | 0.121 | 0.025 | 0.139 | 0.009 | 0.127 | 0.012 |
*Cumulative exposure (mg/m3-years) included in the model as the mean of each exposure category or the natural logarithm (ln cumulative) of the mean.
†Regression coefficient for the increase in the natural logarithm of relative risk per unit increase in cumulative exposure or its logarithm.