Distributions
of
Observed
Breathing
Rates
in
Working
Coal
Miners
0
2
4
6
8
10
12
14
16
18
20
12
14
16
18
20
22
24
26
28
30
Mean,
Z
=
0
1
Std.
Dev.
1
Std.
Dev.
Z
=
+
1
Z
=
­
1
3
2
1
0
­
1
­
2
­
3
10
20
30
40
Fit
of
a
Normal
Distribution
to
the
Minute
Volumes
Observed
in
62
British
Coal
Miners
(
Data
of
Jones
et
al.,
1981)

Z­
Score
y
=
20.760
+
4.6980x
R^
2
=
0.983
3
2
1
0
­
1
­
2
­
3
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
Fit
of
a
Lognormal
Distribution
to
the
Minute
Volumes
of
62
British
Coal
Miners
(
Data
of
Jones
et
al.,
1981)

Z­
Score
log(

Min.

Vol.)
y
=
1.3055
+
0.10273x
R^
2
=
0.962
3
2
1
0
­
1
­
2
­
3
2.0
2.2
2.4
2.6
2.8
3.0
Children
S
12
Yrs
Adolescents
and
Adults
Lognormal
Distributions
of
Cal­
EPA
Estimated
1­
Day
Activity­
Based
Breathing
Rates
Z­
Score
Log(

L/

kg
Body
Weight)

Estimated
Activity­

Based
Ventilation
Rates
y
=
2.66
+
.0618x
R^
2
=
0.983
y
=
2.36
+
0.117x
R^
2
=
0.940
