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. Author manuscript; available in PMC: 2021 Dec 1.
Published in final edited form as: Am J Ind Med. 2019 Oct 24;63(1):36–43. doi: 10.1002/ajim.23060

Figure 2: Participating South African Mn mine workers (N = 187).

Figure 2:

We included all Mn mine workers who had a complete UPDRS3 score (examination), who were not missing Mn exposure data (work history data as of the date of the UPDRS3 exam), and who were not missing the PDQ-39 questionnaire data.

Abbreviations: Mn = manganese; UPDRS3 = Unified Parkinson’s Disease Rating Scale motor subsection part 3; PDQ-39 = Parkinson’s Disease Questionnaire-39.20