Sagittal Abdominal Diameter, Waist Circumference, and BMI as Predictors of Multiple Measures of Glucose Metabolism: An NHANES Investigation of US Adults

Table 4

Shared variance between the anthropometric variables and the glucose metabolism variables by BMI category.

Metabolic measure	SAD			Waist circumference			BMI
	R^2	F	P	R^2	F	P	R^2	F	P
Normal weight ()
OGTT
Model 1	0.026^a	19.0	0.0001	0.034^a	25.7	0.0001	0.021^a	11.5	0.0018
Model 2	0.005^a	4.2	0.0494	0.008^a	8.2	0.0074	0.011^a	8.3	0.0070
Model 3	0.000^a	0.0	0.8902	0.000^a	0.3	0.5726	0.004^b	3.21	0.0825
Fasting glucose
Model 1	0.097^a	180.1	0.0001	0.111^a	113.5	0.0001	0.043^b	33.5	0.0001
Model 2	0.025^a	40.5	0.0001	0.030^a	25.1	0.0001	0.018^a	11.9	0.0016
Model 3	0.002^a,b	1.0	0.3156	0.004^a	2.22	0.1462	0.000^b	0.2	0.6405
HbA1c
Model 1	0.057^a	47.4	0.0001	0.060^a	50.6	0.0001	0.010^b	6.7	0.0146
Model 2	0.002^a	2.3	0.1413	0.002^a	1.3	0.2724	0.000^a	0.0	0.8754
Model 3	0.001^a	1.2	0.2880	0.001^a	0.6	0.4605	0.001^a	1.0	0.3280
HOMA-IR
Model 1	0.088^a	70.6	0.0001	0.075^a	51.8	0.0001	0.069^a	104.6	0.0001
Model 2	0.122^a	110.0	0.0001	0.109^a	93.6	0.0001	0.073^b	111.0	0.0001
Model 3	0.023^a	10.4	0.0029	0.005^b	2.9	0.0991	0.003^b	3.2	0.0854
Overweight ()
OGTT
Model 1	0.065^a	62.2	0.0001	0.026^b	16.2	0.0003	0.011^b	6.4	0.0163
Model 2	0.033^a	24.3	0.0001	0.011^b	10.4	0.0029	0.014^b	9.2	0.0048
Model 3	0.021^a	11.9	0.0016	0.003^b	2.5	0.1273	0.002^b	1.5	0.2231
Fasting glucose
Model 1	0.087^a	97.1	0.0001	0.058^b	53.3	0.0001	0.012^c	9.5	0.0042
Model 2	0.032^a	36.0	0.0001	0.014^b	16.1	0.0003	0.013^b	12.9	0.0011
Model 3	0.017^a	16.8	0.0003	0.001^b	1.1	0.3124	0.001^b	1.1	0.3002
HbA1c
Model 1	0.043^a	42.8	0.0001	0.013^b	16.5	0.0003	0.000^c	0.5	0.4760
Model 2	0.011^a	9.9	0.0036	0.002^b	2.2	0.1456	0.001^b	2.0	0.1656
Model 3	0.013^a	13.1	0.0010	0.003^b	4.3	0.0457	0.000^b	0.1	0.7192
HOMA-IR
Model 1	0.113^a	82.4	0.0001	0.063^b	63.7	0.0001	0.039^b	32.1	0.0001
Model 2	0.123^a	98.4	0.0001	0.070^b	92.9	0.0001	0.041^c	35.8	0.0001
Model 3	0.051^a	22.8	0.0001	0.000^b	0.0	0.9120	0.000^b	0.2	0.6276
Obese ()
OGTT
Model 1	0.040^a	19.8	0.0001	0.016^b	8.3	0.0070	0.007^b	3.9	0.0574
Model 2	0.036^a	20.3	0.0001	0.019^b	13.0	0.0010	0.016^b	9.9	0.0035
Model 3	0.023^a	26.0	0.0001	0.002^b	2.8	0.1024	0.001^b	1.8	0.1906
Fasting glucose
Model 1	0.088^a	38.3	0.0001	0.061^b	21.2	0.0001	0.023^c	11.4	0.0019
Model 2	0.069^a	35.6	0.0001	0.053^a	24.1	0.0001	0.047^b	23.3	0.0001
Model 3	0.015^a	12.6	0.0012	0.000^b	0.0	0.9791	0.000^b	0.1	0.7686
HbA1c
Model 1	0.072^a	41.6	0.0001	0.037^b	14.8	0.0005	0.021^b	14.5	0.0006
Model 2	0.061^a	42.9	0.0001	0.042^b	24.4	0.0001	0.036^b	23.3	0.0001
Model 3	0.020^a	13.8	0.0008	0.000^b	0.3	0.6214	0.001^b	1.4	0.2494
HOMA-IR
Model 1	0.241^a	163.9	0.0001	0.199^b	134.0	0.0001	0.145^c	110.2	0.0001
Model 2	0.252^a	218.2	0.0001	0.204^b	146.6	0.0001	0.174^b	153.5	0.0001
Model 3	0.045^a	33.8	0.0001	0.001^b	0.4	0.5182	0.000^b	0.4	0.5290

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 age, gender, and race. Model 3: adjusted for age, gender, race, and the remaining two anthropometric variables. For example, Model 3 for OGTT and SAD adjusts for age, gender, race, waist circumference, and BMI. ^a,b,cR² values on the same row with the same superscript letter do not differ significantly ().