Table 5.

Comparison of Pearson Correlations Between CGM Variables and 2-Hour Glucose, HbA1c, and FPG With the Hotelling-Williams Test

	2-Hour Glucose Versus HbA1c		2-Hour Glucose Versus FPG		HbA1c Versus FPG
	ρ1–ρ2	P-Value	ρ1–ρ2	P-Value	ρ1–ρ2	P-Value
Average sensor glucose	0.02	.85	0.18	.07	0.17	.05
Day average sensor glucose	0.01	.94	0.18	.07	0.17a	.04
Night average sensor glucose	0.03	.76	0.13	.24	0.10	.28
Peak sensor glucose	0.13	.10	0.29	.0036	0.16	.09
Day peak sensor glucose	0.14	.08	0.31	.002	0.17	.07
Night peak sensor glucose	−0.01	.94	0.11	.26	0.12	.17
Minimum sensor glucose	0.03	.77	−0.06	.59	−0.09	.36
Total AUC	0.01	.87	0.18	.07	0.17	.05
Day AUC	0.004	.96	0.18	.07	0.17a	.04
Night AUC	0.03	.75	0.13	.24	0.10	.29
SD	0.05	.51	0.28a	.0063	0.23a	.01
Excursions ≥ 140	0.03	.72	0.24a	.03	0.21a	.03
Excursions ≥ 200	0.08	.37	0.21a	.049	0.13	.17
% time ≥ 120	0.01	.91	0.18	.09	0.17	.06
% time ≥ 140	0.13	.12	0.28a	.0055	0.15	.10
% time ≥ 200	−0.05	.54	0.08	.42	0.13	.12

ρ1–ρ2 is an estimate of the difference between the correlations, with a positive value indicating that the first variable is more strongly correlated with the CGM variable than the second.

^aCorrelation differences significantly different from zero.