Controlling the healthy worker survivor effect: An example of arsenic exposure and respiratory cancer

H. M. Arrighi, Irva Hertz-Picciotto

Research output: Contribution to journalArticlepeer-review

47 Scopus citations

Abstract

Objective - This investigation sought to examine whether methods proposed to control the healthy worker survivor effect would influence the shape or magnitude of the dose-response curve for respiratory cancer induced by arsenic. Methods - Results from an unadjusted analysis are compared with results obtained by applying four different methods for control of the healthy worker survivor effect to data on arsenic exposure and respiratory cancer. The four methods are: exposure lag, adjustment for work status, cohort restriction, and the G null test. Results - Cohort restriction gave erratic results depending upon the minimum years of follow up used. Exposure lag substantially increased the rate ratios and a non-linear shape (decreasing slope) compared with an unlagged analysis. Adjusting for work status (currently employed v retired or otherwise not employed) yielded slightly higher rate ratios than an unadjusted analysis, with an overall shape similar to the baseline analysis. Results from the G null test procedure of Robins (1986), although not directly comparable with the baseline analysis, did show an adverse effect of exposure that seemed to reach a maximum when exposure was lagged between 10 and 20 years. Conclusions - All results confirm an adverse effect of arsenic exposure on respiratory cancer. In these data, it seems that the healthy worker survivor effect was not strong enough to mask the strong effect of arsenic exposure on respiratory cancer. Nevertheless, several methods show a stronger association between arsenic exposure and respiratory cancer after adjustment for the healthy worker survivor effect, suggesting that for weaker causal associations, studies not controlling for this source of bias will have low power to detect results. Although the G methods are theoretically the most unbiased, further work elucidating the validity of the assumptions underlying lagging, adjustment for work status, and the G methods are needed before clear recommendations can be made.

Original languageEnglish (US)
Pages (from-to)455-462
Number of pages8
JournalOccupational and Environmental Medicine
Volume53
Issue number7
StatePublished - 1996
Externally publishedYes

Keywords

  • arsenic
  • bias
  • healthy worker effect
  • respiratory tract neoplasm

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • Environmental Science(all)

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