Corrections to the target and critical values for the National Institute for Occupational Safety and Health validation tests.
Fischbach-T; Kennedy-E; Shulman-S; Busch-K; Eller-P; Song-R; Doemeny-L
Am Ind Hyg Assoc J 1996 May; 57(5):452-455
The accuracy criterion (AC) and statistical protocol developed by NIOSH for use with NIOSH and OSHA industrial hygiene exposure standards were reviewed. Corrections to the protocol's target and critical coefficients of variation (CV) were introduced. Definitions were provided for bias, bias ratio, CV, maximum permissible CV, critical CV, and inaccuracy, and the contribution of these factors to AC were elucidated. The original statistical protocol devised by NIOSH did not factor the effects of bias, an omission that led to errors in the calculation of critical CVs. Graphical presentations were provided that illustrate the difference between the original statistical protocol and those corrected for bias. Accuracy levels obtained using the corrected statistical protocol were compared with those obtained using methods that barely met or failed the original uncorrected criteria. The maximum potential effect of the bias omission error were also illustrated. The corrected statistical protocol produces values that are more restrictive than those originally published.
NIOSH-Author; Industrial-hygiene; Exposure-limits; Analytical-models; Mathematical-models; Statistical-analysis;
Author Keywords: accuracy; accuracy criterion; bias; coefficient of variation; exposure standards; precision
Thomas Fischbach, National Institute for Occupational Safety and Health, 4676 Columbia Parkway, Cincinnati, OH 45226
American Industrial Hygiene Association Journal