Table 3.

Brachial artery diameter and FMD measurements

			FMD
	n	Baseline Diameter, mm	mm	%
Young adults	12
QRS wave-gated		5.29 ± 0.84	0.35 ± 0.12	6.6 ± 1.9
Average		5.33 ± 0.82	0.35 ± 0.13	6.5 ± 1.7
Middle-aged adults	17
QRS wave-gated		3.79 ± 0.72	0.25 ± 0.06	6.4 ± 0.7
Average		3.86 ± 0.72	0.25 ± 0.06	6.4 ± 0.8
Older adults	14
QRS wave-gated		3.51 ± 0.61	0.22 ± 0.05	6.6 ± 1.3
Average		3.46 ± 0.56	0.23 ± 0.04	6.6 ± 1.0
DM adults	29
QRS wave-gated		3.63 ± 0.71	0.13 ± 0.06	3.9 ± 2.0
Average		3.64 ± 0.70	0.13 ± 0.06	3.8 ± 1.8

Values are means ± SD. FMD, flow-mediated dilation. There were no significant differences in baseline diameter, FMDmm, and FMD% between measurement methods within each of the 3 study groups (P > 0.05 for all comparisons). For between-group comparisons, baseline diameter (QRS-gated and average): P < 0.05, young adults vs. all other groups. For FMDmm ECG and average-gated: P < 0.05, all groups vs. DM adults. For FMD% ECG and average-gated, P < 0.05, all groups vs. DM adults. Findings are identical for FMD ECG and FMD%.