Lung cancer mortality among members of the Plumbers and Pipefitters United Association by time of start of membership and time from start of membership
| Trade | Year of beginning membership | Years from start of membership | |||||
|---|---|---|---|---|---|---|---|
| 10–19 | 20–29 | ⩾30 | |||||
| Obs | O/E | Obs | O/E | Obs | O/E | ||
| Pipefitters | 1950–69 | 16 | 1.18 | 39 | 1.28 | 56 | 1.53 |
| 1970–79 | 5 | 0.91 | 3 | 0.58 | – | − | |
| 1980 or later | 2 | 1.3 | − | − | − | − | |
| Refrigeration | 1950–69 | 4 | 1.35 | 1 | 0.16 | 7 | 1.21 |
| 1970–79 | 2 | 0.63 | 2 | 0.67 | – | − | |
| 1980 or later | 1 | 1.3 | – | – | – | – | |
| Plumbers | 1950–69 | 3 | 0.57 | 17 | 0.95 | 53 | 1.31 |
| 1970–79 | 8 | 1.23 | 10 | 1.43 | – | − | |
| 1980 or later | 3 | 1.17 | − | – | – | − | |
| Sprinkler Fitters | 1950–69 | 9 | 0.83 | 39 | 1.57 | 45 | 1.32 |
| 1970–79 | 8 | 1.79 | 6 | 1.32 | – | − | |
| 1980 or later | 1 | 0.9 | – | – | – | − | |