N013
Assessment of the Validity of QnFT in Selecting RPE
ABSTRACT
Quantitative Fit Testing (QnFT) is widely used in
selecting RPE. Implicit in such use of
QnFT is the assumption that either Quantitative Fit Factors (QnFF) and
Workplace Protection Factors (WPF) are statistically correlated or that a
“good” QnFF suggests that a “good” WPF will be achieved.
The literature was searched to determine the validity
of such assumptions.
Colton et al (1989) reported: The quantitative fit factors
that were obtained did not predict which workers would have the highest or
lowest WPF. ….It appears there was no correlation between WPF and quantitative
fit factor.
Dixon & Nelson (1984) concluded: Quantitative fit testing cannot
be used to quantitatively predict workplace performance of respirators for an
individual.
Gaboury & Burd (1989) reported: No relationship was found between quantitative
fit factors measured by the Portacount and the WPF ….
Myers et al (1984a, b) reported that there was no significant linear
association between quantitative fit factors and WPF.
From the available literature there is unanimity that
QnFF and WPF were not usefully correlated, i.e. QnFF do not predict likely WPF
and a “good” QnFF does not predict a “good” WPF.