Sagittal Abdominal Diameter, Waist Circumference, and BMI as Predictors of Multiple Measures of Glucose Metabolism: An NHANES Investigation of US Adults
Table 6
Shared variance between the anthropometric variables and the glucose metabolism variables by age category.
Metabolic measure
SAD
Waist circumference
BMI
R2
F
P
R2
F
P
R2
F
P
20–39 years ()
OGTT
Model 1
0.089a
125.5
0.0001
0.080a
98.2
0.0001
0.081a
94.2
0.0001
Model 2
0.092a
126.7
0.0001
0.080b
92.7
0.0001
0.079b
89.9
0.0001
Model 3
0.011a
12.3
0.0014
0.000b
0.5
0.4835
0.000b
0.1
0.7204
Fasting glucose
Model 1
0.145a
169.7
0.0001
0.135a
128.9
0.0001
0.103b
123.8
0.0001
Model 2
0.121a
137.6
0.0001
0.114a
105.3
0.0001
0.101b
108.1
0.0001
Model 3
0.010a
12.6
0.0012
0.001b
2.1
0.1532
0.001b
2.2
0.1474
HbA1c
Model 1
0.071a
56.9
0.0001
0.062b
52.1
0.0001
0.055b
43.2
0.0001
Model 2
0.052a
38.7
0.0001
0.050a
38.6
0.0001
0.045a
33.5
0.0001
Model 3
0.003a
2.3
0.1367
0.001b
0.9
0.3592
0.000c
0.4
0.5333
HOMA-IR
Model 1
0.429a
821.3
0.0001
0.404b
589.8
0.0001
0.384c
705.6
0.0001
Model 2
0.441a
1348.7
0.0001
0.417b
917.3
0.0001
0.383c
959.0
0.0001
Model 3
0.027a
58.4
0.0001
0.003b
9.1
0.0049
0.001c
2.0
0.1703
40–59 years ()
OGTT
Model 1
0.067a
59.1
0.0001
0.049b
37.2
0.0001
0.049b
37.7
0.0001
Model 2
0.078a
59.3
0.0001
0.059b
43.0
0.0001
0.052b
41.5
0.0001
Model 3
0.024a
30.4
0.0001
0.002b
1.6
0.2148
0.001b
1.2
0.2775
Fasting glucose
Model 1
0.115a
124.0
0.0001
0.100b
114.1
0.0001
0.070c
75.6
0.0001
Model 2
0.101a
128.1
0.0001
0.087b
117.3
0.0001
0.078b
93.7
0.0001
Model 3
0.014a
16.7
0.0003
0.000b
0.0
0.8585
0.000b
0.3
0.5693
HbA1c
Model 1
0.070a
72.0
0.0001
0.055b
57.5
0.0001
0.050b
42.3
0.0001
Model 2
0.069a
68.7
0.0001
0.059b
64.7
0.0001
0.049b
45.8
0.0001
Model 3
0.011a
12.5
0.0013
0.000b
0.0
0.8751
0.001c
1.9
0.1837
HOMA-IR
Model 1
0.411a
344.9
0.0001
0.381b
244.5
0.0001
0.349c
221.1
0.0001
Model 2
0.415a
341.9
0.0001
0.380b
247.6
0.0001
0.351c
226.7
0.0001
Model 3
0.031a
29.2
0.0001
0.000b
0.4
0.5168
0.000b
0.2
0.6405
60–84 years ()
OGTT
Model 1
0.069a,c
18.9
0.0001
0.050b
15.6
0.0004
0.063c
22.2
0.0001
Model 2
0.090a
21.3
0.0001
0.081a
25.4
0.0001
0.082a
26.2
0.0001
Model 3
0.005a
1.7
0.2053
0.000b
0.0
0.8875
0.002c
1.2
0.2732
Fasting glucose
Model 1
0.127a
14.6
0.0006
0.117a
13.4
0.0009
0.111a
12.9
0.0011
Model 2
0.124a
15.2
0.0005
0.115a
13.9
0.0007
0.122a
14.0
0.0007
Model 3
0.004a
2.8
0.1035
0.000b
0.0
0.9111
0.004a
3.2
0.0834
HbA1c
Model 1
0.062a,c
13.3
0.0009
0.033b
5.7
0.0229
0.054c
11.1
0.0022
Model 2
0.073a,c
17.5
0.0002
0.049b
9.3
0.0047
0.062c
12.2
0.0014
Model 3
0.021a
12.8
0.0011
0.010b
4.6
0.0407
0.002c
1.6
0.2227
HOMA-IR
Model 1
0.445a
265.6
0.0001
0.407b
271.1
0.0001
0.396b
173.0
0.0001
Model 2
0.442a
261.6
0.0001
0.415b
274.9
0.0001
0.401b
185.8
0.0001
Model 3
0.021a
30.8
0.0001
0.002b
2.1
0.1545
0.003b
1.8
0.1913
R2 includes only the shared variance between the metabolic measure and the anthropometric variable. Variance from the covariates is not included. Model 1: includes no covariates. Model 2: adjusted for gender and race. Model 3: adjusted for gender, race, and the remaining two anthropometric variables. For example, Model 3 for OGTT and SAD adjusts for gender, race, waist circumference, and BMI. a,b,cR2 values on the same row with the same superscript letter do not differ significantly ().