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Continuing Education — "The Action Level!®"

VOLUME 3(11), November 2006
Journal of Occupational and Environmental Hygiene

Answer the questions below and click "Submit".

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CASE STUDIES:

Factors Influencing Restaurant Worker Perception of Floor Slipperiness
Theodore Courtney, Yueng-hsiang Huang, Santosh Verma, Wen-ruey Chang, Kai Way Li and Alfred Filiaggi

1. Worker age was reported to have significant association with
    slipperiness perception. What potential alternative explanatory
    factors for this observation do the authors also discuss?

a. gender, language, and footwear
b. job tenure, hours worked per week, lifetime
         experience
c. job tenure, gender, language
d. hours worked per week, experience, footwear
e. friction, job tenure, lifetime experience
2. Slipperiness ratings from workers who reported a slip and/or fall
    in the prior four weeks at work were poorly correlated with friction
    measurements. True or False?
True
False
Powered Air-Purifying Particulate Respirator Filter Penetration by a DOP Aerosol
Stephen Martin, Ernest Moyer and Paul Jensen

3. Under the current NIOSH respirator certification regulation (42 CFR
    84), all PAPR filters are magenta in color. This magenta color
    indicates that all NIOSH certified PAPR filters are suitable for use
    against oil aerosols unless limited by the manufacturer.
    True or False?

True
False
4. While not currently required by 42 CFR 84, a laboratory based
    PAPR filter loading test with DOP aerosol could help:
a. Determine whether a filter is electrostatic or purely
          mechanical
b. Determine whether filtration efficiency could
          degrade with aerosol load
c. Determine whether a manufacturer should limit
          use to non oil aerosols
d. a and b only
e. a, b, and c
Integrated Unit Performance Testing of Powered Air-Purifying Particulate Respirators Using a DOP Challenge Aerosol
Stephen Martin, Ernest Moyer and Paul Jensen

5. Workplace protection factor (WPF) and simulated workplace
    protection factor (SWPF) studies with PAPRs always provide fit
    factors above the corresponding NIOSH Assigned Protection Factor
    (APF) for the respirator. True or False?

True
False
6. You can tell that a PAPR filter uses electrostatic properties to
    enhance filtration (as apposed to a strictly mechanical filter) by
    careful visual inspection. True or False?
True
False
Generalized P-Values and Confidence Intervals: A Novel Approach for Analyzing Lognormally Distributed Exposure Data
K. Krishnamoorthy, Thomas Mathew and Gurumurthy Ramachandran

7. Many standard statistical procedures require large samples for
    their validity. However, for the lognormal distribution, the concepts
    of generalized p values and generalized confidence intervals
    are applicable even to small samples. True or False?

True
False
8. For the lognormal distribution, the generalized confidence interval
    for the geometric standard deviation coincides with the usual
    confidence interval based on the chi square distribution. True or
    False?
True
False
A Comparison of Total, Respirable and Real-time Airborne Particulate Sampling in Horse Barns
Frank S. Rosenthal, Alisha Gruntman and Laurent L. Couetil

9. For the same airborne mass concentration what was the response
    of the aerosol photometer, used in this study, to horse barn dust
    compared to its response to Arizona Road Dust (ARD)?

a. The response to horse barn dust was greater
b. The response to horse barn dust was less
c. The responses were approximately equal
d. There was no relationship between the responses
10. One factor affecting the ratio of real time measures of aerosol
      concentration to gravimetric measurements that is discussed
      in the paper is:
a. particle density
b. wind currents
c. settling velocity
d. humidity
CFD Investigation of Room Ventilation for Improved Operation of a Downdraft Table: Novel Concepts
Buvaneswari Jayaraman, Astrid H. Kristoffersen, Elizabeth U. Finlayson and Ashok J. Gadgil

11. Using the definition of spill measure in the article, how does the
      spill measure change if twice as much tracer gas is released into
      the room for the same airflow?

a. increases by a factor of 2
b. decreases by a factor of 2
c. no change
12. Particle tracks of the airborne particle alone give a good indication
      of containment of the contaminants in the room. True or False?
True
False


Deadline for answers is November 30, 2006.

Answers will be available online at
http://www.acgih.org/products/joeh/alanswers.htm
on December 15, 2006.

 
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