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  1. Vidar Søyseth1,2,
  2. Helle Laier Johnsen1,
  3. Johny Kongerud2,3
  1. 1Medical Division, Akershus University Hospital, Lørenskog, Norway
  2. 2 Faculty of Medicine, Universty of Oslo
  3. 3Department of Respiratory Medicine, Faculty Division Rikshospitalet Radiumhospitalet, University of Oslo, Oslo, Norway
  1. Correspondence to Professor Vidar Søyseth, Medical Division, Akershus University Hospital, Sykehusvn 25, Lørenskog 1478, Norway; vidar.soyseth{at}medisin.uio.no

https://doi.org/10.1136/oemed-2012-100695

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    We thank Dr Eva Hnizdo and Professor Edward L Petsonk for their highly appreciated comments on our publication in Occupational Environmental Medicine.1

    Their first and highly relevant question is about the magnitude of the annual decline of forced expiratory volume in one second (FEV1) denoted as dFEV1 among workers with FEV1/forced vital capacity (FVC) ratio <0.7 and lower limit of normal (LLN) compared with dFEV1 among workers with FEV …

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    Footnotes

    • Funding This study was supported by the Norwegian Smelter Industry.

    • Competing interests None.

    • Ethics approval Ethics approval was provided by the Regional Ethics Committee, Eastern Norway.

    • Provenance and peer review Not commissioned; internally peer reviewed.