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o-Toluidine assigned rank in high-exposed production departments (Departments 245–255) of a chemical manufacturing plant over three periods
| n | Mean OT rank | |
|---|---|---|
| Period 3 1970–79 | 27 | 10 |
| Period 4 1980–94 | 205 | 8 |
| Period 5 1995–07 | 127 | 3 |
Personal TWA air samples
