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Neurocognitive Effects in Welders Exposed to Aluminium: An Application of the NPC Test and NPC Ranking Methods

Author

Listed:
  • Stefano Bonnini

    (University of Padova)

  • Livio Corain

    (University of Padova)

  • Fortunato Munaò

    (University of Messina)

  • Luigi Salmaso

    (University of Padova)

Abstract

The aim of this study is to investigate the effects of exposure to aluminium on the cognitive sphere in a group of welders. Given the intrinsic complexity of the neurocognitive sphere, three different psychomotor variables were used for its investigation allowing the resulting problem to be naturally modelized into a multivariate framework and solved by a nonparametric combination of permutation tests (NPC test). In order to make the treated and control groups comparable, we also stratified the samples on the basis of a risk index that estimates the combined action of biological age and exposure time. Despite the fact that studies in the literature have reached conflicting results, our study highlights a significant drop in attention and memory performances in individuals exposed to aluminium. Finally, we identify a global criterion that summarises the information on the neurocognitive state by applying the nonparametric combination of dependent rankings method (NPC ranking).

Suggested Citation

  • Stefano Bonnini & Livio Corain & Fortunato Munaò & Luigi Salmaso, 2006. "Neurocognitive Effects in Welders Exposed to Aluminium: An Application of the NPC Test and NPC Ranking Methods," Statistical Methods & Applications, Springer;Società Italiana di Statistica, vol. 15(2), pages 191-208, August.
    • Handle: RePEc:spr:stmapp:v:15:y:2006:i:2:d:10.1007_s10260-006-0019-3
    DOI: 10.1007/s10260-006-0019-3
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    References listed on IDEAS

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    1. Alessandro Lago & Fortunato Pesarin, 2000. "Nonparametric combiantion of dependent rankings with application to the quality assessment of industrial products," Metron - International Journal of Statistics, Dipartimento di Statistica, Probabilità e Statistiche Applicate - University of Rome, vol. 0(1-2), pages 39-52.
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    Cited by:

    1. Massimiliano Giacalone & Agata Zirilli & Mariacarla Moleti & Angela Alibrandi, 2018. "Does the iodized salt therapy of pregnant mothers increase the children IQ? Empirical evidence of a statistical study based on permutation tests," Quality & Quantity: International Journal of Methodology, Springer, vol. 52(3), pages 1423-1435, May.
    2. Stefano Bonnini & Getnet Melak Assegie & Kamila Trzcinska, 2024. "Review about the Permutation Approach in Hypothesis Testing," Mathematics, MDPI, vol. 12(17), pages 1-29, August.

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