Table 3.

Correlation between HbA1C and FPG, OGT and HbA1C, and OGT and FPG in non-diabetic American children and adults.

	HbA1C and FPG				OGT and HbA1C				OGT and FPG
	NHW	NHB	MA	OR	NHW	NHB	MA	OR	NHW	NHB	MA	OR
Age category
12–19	0.251**	0.148	0.387**	0.293**	0.126	0.204	0.128	0.183	0.222*	0.377**	0.308**	0.133
20–29	0.207*	0.162	0.363**	0.392**	0.173	0.159	0.133	0.140	0.230*	0.301*	0.352**	0.251
30–39	0.330**	0.366**	0.169	0.293*	0.318*	0.050	0.275*	0.324*	0.472**	0.126	0.106	0.425**
40–49	0.214**	0.375**	0.236	0.329*	0.226**	0.054	0.063	0.076	0.424**	0.305*	0.043	0.328*
50–59	0.325**	0.377**	0.316*	0.249**	0.250**	0.137*	0.235**	0.210*	0.426**	0.188	0.178	0.334*
60–69	0.385*	0.427**	0.468**	0.456**	0.290**	0.210*	0.395**	0.324**	0.220*	0.255	0.223	0.020
>70	0.407**	0.463	0.612**	0.507**	0.334**	0.236**	0.606*	0.444**	0.246**	0.004	0.725*	0.398*
BMI category
<20	0.241*	0.183	0.230	0.376**	0.147	0.153	0.248	0.115	0.315**	0.302	0.124	0.071
20–24.9	0.315**	0.209**	0.283**	0.338**	0.262**	0.194*	0.222*	0.259*	0.396**	0.341**	0.175	0.384**
25–29.9	0.236**	0.227**	0.291*	0.350**	0.232**	0.224**	0.110	0.352**	0.403**	0.367**	0.330**	0.473**
30–34.9	0.290**	0.189*	0.336**	0.365**	0.357**	0.235*	0.249*	0.337**	0.423**	0.249*	0.091	0.337**
35–39.9	0.385**	0.346*	0.462**	0.347*	0.371**	0.287**	0.285*	0.348*	0.482**	0.534**	0.385*	0.584*
>40	0.605**	0.457*	0.467**	0.435**	0.394**	0.388*	0.398**	0.374**	0.200	0.016	0.535	0.018

NHW, non-Hispanic White; NHB, non-Hispanic Black; MA, Mexican-American; OR, other races; values are Pearson’s product-moment correlation coefficients.

FPG, fasting plasma glucose; HbA1C, hemoglobin A1C; OGT, oral glucose tolerance test.

*P < 0.05; **P < 0.01.