Doekes (1998) Evaluation of chronic respiratory effects in the potato processing industry: indications of a healthy worker effect
The authors attribute this to the healthy worker effect
, but this seems to be an unlikely explanation for such a large effect.
If this "healthy worker effect
" is controlled for in such studies, she adds, it, seems that Hanford does pose significant health dangers.
The SMR in 1959 was 0.81, consistent with a healthy worker effect
(Choi 1992; Li and Sung 1999).
This is a common occurrence in occupational investigations known as the "healthy worker effect
," a combination of several factors associated with employment such as selection of the work force and changes in lifestyle accompanying employment (Monson 1986; Wen et al.
A better appraisal of the healthy worker effect
and the observation of a higher susceptibility to radiation with age over 45 have been proposed to explain certain results of the Oak Ridge study (38).
No chance here of a skewed study as a result of "healthy worker effects
"--where healthier workers are preferred over less healthy ones--as they were hired at random from the same employment line.