QTP4B071-17 — Trend Analysis

QTP4B071-17 governs trend analysis of environmental health data and occupational health data in bioenvironmental engineering.

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  • Publication number: QTP4B071-17
  • Title: Trend Analysis
  • Date: 2024-03-08

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It covers statistical and visual methods, trend identification, exposure profiles, and recommendations. It requires data entry and calculations using the IHSTAT Excel program, including the lognormal 95th percentile and comparison to the OEEL.

Topics covered

  • Environmental health data trend analysis
  • Occupational health data trend analysis
  • Statistical and visual analysis methods
  • Exposure profile determination
  • Lognormal 95th percentile
  • OEEL comparison
  • IHSTAT Excel program

Questions and answers

When is visual statistical analysis most useful for trend analysis?

Visual is most useful for tracking/visualizing significant changes over time and is generally used with several data points are collected over time from the same location. (paragraph 1)

What methods can be used for visual statistical analysis?

Visual statistical analysis can be done with several methods including histograms, graphs, time series plot, and spatial data plots. (paragraph 2)

Why should environmental health data trend analysis be performed?

A trend analysis is useful for identifying changes in COCs over time and/or spatial variations in COCs over an area of concern. (paragraph 2)

What can trend analysis help determine about controls or process changes?

Trend analysis can help determine if engineering controls or process changes are effective at reducing overall exposures. (paragraph 2)

How are calculations performed in the IHSTAT program?

Calculations will be done using IHSTAT excel program. This is done automatically by entering results into the “Sample Data” block of IHSTAT, shown below. (paragraph 3)

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