Intercept | 3.58 (3.43 to 3.73)* | 0.0001 | 4.27 (4.10 to 4.43) | 0.0001 | 83.5 (81.4 to 85.7) | 0.0001 | 4.38 (3.76 to 5.00) | 0.0001 |
| | | | | | | | |
Ex-smokers | −0.030 (−0.278 to 0.218) | 0.813 | 0.129 (−0.149 to 0.407) | 0.366 | −3.26 (−6.79 to 0.28) | 0.0731 | −0.484 (−1.23 to 0.27) | 0.217 |
| | | | | | | | |
Duration of smoking for ex-smokers (years) | 0.00336 (−0.0196 to 0.0263) | 0.776 | −0.00728 (−0.0330 to 0.0184) | 0.581 | 0.173 (−0.153 to 0.500) | 0.302 | 0.0100 (−0.0762 to 0.0962) | 0.824 |
| | | | | | | | |
Current smokers | −0.0631 (−0.165 to 0.039) | 0.230 | 0.0190 (−0.095 to 0.133) | 0.747 | −1.56 (−3.02 to −0.11) | 0.0366 | −0.0392 (−0.431 to 0.353) | 0.848 |
| | | | | | | | |
Pack-years for current smokers | 0.00113 (−0.00412 to 0.00636) | 0.676 | 0.00305 (−0.00282 to 0.00891) | 0.313 | −0.0694 (−0.144 to 0.005) | 0.0705 | −0.0370 (−0.0618 to −0.0122) | 0.0046 |
| | | | | | | | |
Operation | −0.0125 (−0.153 to 0.128) | 0.863 | 0.0731 (−0.084 to 0.230) | 0.365 | −1.46 (−3.45 to 0.541) | 0.156 | −0.479 (−1.06 to 0.101) | 0.115 |
| | | | | | | | |
Maintenance | 0.0154 (−0.152 to 0.183) | 0.858 | 0.0523 (−0.135 to 0.240) | 0.587 | −0.669 (−3.05 to 1.71) | 0.585 | −0.523 (−1.17 to 0.125) | 0.123 |
| | | | | | | | |
Electricity | −0.0145 (−0.240 to 0.211) | 0.900 | −0.0252 (−0.278 to 0.228) | 0.846 | −0.298 (−3.51 to 2.91) | 0.857 | 0.0456 (−0.99 to 1.08) | 0.933 |
| | | | | | | | |
R square | 0.0035 | | 0.0054 | | 0.0231 | | 0.0647 | |
No. of observations† | 613 | | 613 | | 613 | | 202 | |