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| Poison in plantations | ||
| Duration of work (in years) | Total number of plantation workers | Number of workers suffering from Parkinsons disease |
| 0 | 5363 | 73 |
| 1-10 | 1843 | 24 |
| 11-20 | 315 | 7 |
| More than 20 | 465 | 12 |
| Source:Arch Neurol, Vol 59, November 2002 | ||