Document gm04pv68z94wma927Jr6BNJG
May 2 1931
Table showing means and standard deviations with their respective probable errors for 'milligrams of lead per liter ofn urine for the groups as indicated.
Milligrams of lead per liter of urine
GROUP
Tank Wagon Ethyl 101-150
j MEAN .100
P.E. + .001
SIGMA .010
P.E. +.0007
Garage Mechanics, Exposure 301-501
.094
+ .005
.097
+.003
Filling Station, Ethyl 1-56
.079
+ .007n .080
+ .005
Barrel Fillers, Plain 201-227
.058
+.009 : .071
+ .007
Barrel Fillers, Ethyl 251-272
.052
+ .004
.030
+.003
KB 0019089
May 2 1931
Table showing Means and standard deviations with their respective probable' errors for milligrams of lead per gram of faeces ash for the groups as indicated.
GROUP
Tank Wagon, Ethyl 101-150
Barrel Fillers, Plain 201-227
Garage Mechanics, Exposure 301-501
Barrel Fillers, Ethyl 251-272
Filling Station, Ethyl 1-56
Milligrams of lead per gram of ash in faeces.
MEAN
P.E.
SIGMA
P.E.
.170
+.009
.080
+.006
.137
+^*014
.I06n
+.009
.131
+ .005
.095
+. 003
.113
+ .010
.094
+.007
.097
+ . 010
.094
*.007
Kir 0019090
May 7 1931
Table -showing means and. standard deviations with their respective probable errors for milligrams of lead per gram of faeces ash for
the groups as indicated.
GROUP
Barrel Fillers, Plain 201-227
Garage Mechanics, Exp. 301-501
Tank Wagon Ethyl + 101-149
Barrel Fillers,Ethyl 251-272
Filling Station,Ethyl
Milligrams of lead per gram of ash in faeces
MEAN
P.E.
SIGMA
P.E.
.137
+.014
.106
+.009
.131
+ .005
.095
+ 005
.119
+ .013
.109
+.009
.113
+ .010
.094
+.007
.097
+ .010
.094
+ .007
+ indicates the exclusion of case ilumber 150
......... 11 `
.................. . -
--
-
___ i
None of the differences between the means is significant.
KE 0019091
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Correlation coefficients
'Garage Mechanics
length of service and lead in faeces, mgs.per grm.ash
Length of service and lead in urine, mgrs. per liter
Length of exposure to ethyl gasoline and lead in faeces mgrs. per grm* ash
Length of exposure to ethyl gasoline and lead in urine mgrms. per liter
+.017 +f056 +.023 +.055 +.223 +.099 4^*243 +.099
There is no significant correlation. All coefficients are less than four times their respective probable errors. The change of sign in the case of the last coefficient, of itself, has no significance. In the case of the first two coefficients, they are less than their own probable errors, in spite of the fact that the universe was much larger than In the case of the last two.
HE 0019095