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

Table 2

Shared variance between the anthropometric variables and the glucose metabolism variables.

Metabolic measure	SAD			Waist circumference			BMI
All subjects ()	R^2	F	P	R^2	F	P	R^2	F	P
OGTT
Model 1	0.092^a	162.8	0.0001	0.073^b	128.7	0.0001	0.057^c	119.4	0.0001
Model 2	0.073^a	163.5	0.0001	0.059^b	164.0	0.0001	0.058^b	162.5	0.0001
Model 3	0.014^a	32.1	0.0001	0.001^b	4.2	0.0483	0.000^c	0.0	0.8989
Fasting glucose
Model 1	0.146^a	184.2	0.0001	0.130^b	146.0	0.0001	0.085^c	118.3	0.0001
Model 2	0.106^a	192.2	0.0001	0.094^b	158.1	0.0001	0.088^b	157.7	0.0001
Model 3	0.011^a	31.2	0.0001	0.000^b	0.0	0.9376	0.000^b	0.3	0.5996
HbA1c
Model 1	0.090^a	166.7	0.0001	0.068^b	114.9	0.0001	0.048^c	100.7	0.0001
Model 2	0.056^a	129.1	0.0001	0.046^b	110.1	0.0001	0.044^b	97.7	0.0001
Model 3	0.010^a	25.0	0.0001	0.001^b	1.1	0.2958	0.000^c	0.3	0.6094
HOMA-IR
Model 1	0.423^a	1051.6	0.0001	0.394^b	683.6	0.0001	0.371^c	837.3	0.0001
Model 2	0.426^a	1198.1	0.0001	0.393^b	761.9	0.0001	0.366^c	871.5	0.0001
Model 3	0.031^a	85.4	0.0001	0.001^b	3.9	0.0583	0.000^c	0.0	0.9733

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 ().