4if
é
Measures of Body Fat and Related Factors in Normal Adults —I1
1299
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Table 5 presents the regression equations using two, three and four variables for
each category and combinations of categories. Weight is in pounds; skinfold
thickness is in millimeters; other measurements are in centimeters. Incorporation of
additional variables resulted in little further increase in the multiple correlation
coefficients. Although the linearity of the relationships has been questioned [10],
LTIPLE CORRELATIONS
the size of the multiple correlation coefficients indicates that the non-linearity.
gra| ol ay
Multiple
correlation
with
measured
:
— 39.408
0.920
x
— 41.448
0.909
ngth
0.913
0.930
+23.173
0.972
0.977
0.980
0.946
0.963
+39.358
0.970
0.917
0.933
th
~ 37.294
0,937
— 29.836
0.914
0.922
0.927
0.914
0.924
— 20.832
0.929
0.905
0.913
— 36.165
0.918
Sey Je athe
oo
0.937
wnateatinak a nedlern SRYee‘yale. SPERroad
wpe Loyleh
cag eyes
8
aie Ca.
gth
— 26.189
Sfatebn teste. —
It
-
0.930
eet
35.689
.
0.918
though perhapsstatistically significant, is substantively not important.
TABLE 6. STANDARD ERROR OF ESTIMATE AND 95°5 CONFIDENCE INTERVALS FOR KILOGRAMS BODY
FAT OF ‘AVERAGE’ INDIVIDUALS, BY CATEGORY AND NUMBER OF PREDICTOR VARIABLES
Category
I
Il
No. of
variables
2
3
4
2
1V
Vv
S.E.
Mean
95°% confidence interval
.
Individual
Population
piean
2.635
2.402
2840 i7141128-2300
17.14
17.14
11.69-22.59
12.17-22.11
16.16-18.12_
2.761
20.67
14.96-26.38
19.70—21.64
2.683
2.557
20.67
15.37-25.97
19.77-21.57
2
3.037
19.00
12.70-25.30
17.92-20.08
3
4
2
3
2.792
2.690
2.337
2.151
20.67
19,00
19,00
23,30
23.30
15.11-26.23
16.23-18.05
16.31-17.97
3
4
III
Body fat in kg
19.73-21.61
13.20-24.80
13.41-24.59
18.43-28. 17
18.81-27.79
18.00-20.00
18.04—19.96
22.44-24.16
22,.51—-24,09
4
2.044
23.30
19,02—27.458
22.54-24.06
2
3.776
18.58
10.76—26.40
£7.26-19,90
4
3.665
18.58
10.98-26.18
17.29-19.87
3
3.747
18.58
10.8 1-26.35
17.27-19.89
tes
ngeth
— 31.268
0.959
A
ala
SF.
~ 45.464
Pady whe eet REEeb. +ni, » Pad,2 2a
ax
SFE.
ie ayh
yates ‘ea!aieSSL SRSe
fatin ke
Table 6 illustrates the precision of estimation of the equations by considering, in
each category, a hypothetical ‘average’ individual, each of whose anthropometric
measurements is exactly equal to the mean for his category. In each case the 95°.
confidence interval [11] for the estimate of kilograms of body fat of an individual
is given, as well as the 95% confidence interval for the estimate of the mean value
for kilograms of body fat for a population in which all individuals had measure-
ments equal to the mean forhis category.
ESTIMATION
OF
LEAN BODY WEIGHT
CONTENT
FROM
K-40
Means, standard deviations and ranges for K*® measurements in counts/min and
the measurements derived therefrom appear in Table 7. LBW**° and LBM for
subjects studied with both the whole-body counting and TBW-body density techniques are also presented. (The body weight as measured at the time of laboratory
study was used for the calculation of LBM for this table. For Table 3, LBM was
calculated from the body weight taken for anthropometric measurements. The
largest discrepancy between these two measurements for any one individual was
0.7 kg).
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oeat
t necessarily those
able after the first