Statistical Analyses for Occupational Exposure Results

NIOSH released a guide, Occupational Exposure Sampling Strategy Manual (1977), that describes statistical analyses for occupational exposure results in a clear and concise manner. Included are discussions and examples on:

  • Confidence Limits (CL’s)
  • CL’s and Compliance / Non-compliance Classifications
  • Statistics and Classifications for: full period sampling, partial period sampling, consecutive sampling, grab sampling, comparison to ceiling standards, and more.

If you are looking for a (free) guide that details “real world” occupational exposure statistical analyses, download NIOSH’s guide HERE ().

IHSTAT – Statistical Analysis of Health & Safety Data


IHSTAT is a excel worksheet that enables statistical analyses of occupational hygiene measurement data and compliance testing (with occupational exposure limits).  IHSTAT was developed by AIHA (American Industrial Hygiene Association).

  1. Determines whether samples are normally distributed or log normally distributed.

    • Normal distribution – data that clusters around a mean/average
    • Log Normal distribution – the logarithm of data is normally distributed
  2. Determines percentage of samples that exceed the occupational exposure limit


  IHSTAT (147.0 KiB, 2,680 hits)