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Table 1 Anesthetist exposure to anesthetic gases (nitrous oxide and isoflurane) measured in the operating rooms of the Veneto Region, 1990-2002, by personal sampling: survey year, number of samples, mean and standard deviation (in parts per million, ppm), percentage of measurement exceeding the standard (Exceedance %), and references

From: Exposure to anesthetic gases and Parkinson’s disease: a case report

Year N. Samples Mean (ppm) Standard deviation (ppm) Exceedance % References
Nitrous oxide
1990 10 259.25 108.42 100 [1]
1994 7 107.1* 135.5* [3]
1999 27 46.9 55.5 33.3 [2]
Forane
1994 7 2.88* 3.4* [3]
1999 27 2.5 4.5 14.8 [2]
  1. *environmental concentration values recalculated from the urine concentration.