Vascular measures—baseline
mean flow-mediated dilation
DILATION
Among ME/CFS patients, mean diameter pre-occlusion was 3.00 mm (SD 0.50 mm); mean post-occlusion diameter at maximum dilation was 3.15 mm (SD 0.51 mm). For healthy women, mean diameter pre-occlusion was 2.94 mm (SD 0.42 mm); mean post-occlusion diameter at maximum dilation was 3.19 mm (SD 0.44 mm). Compared by unpaired t-test (equal variances not assumed), mean flow-mediated dilation (FMD) in ME/CFS patients at baseline was 4.9% (SD 3.6), significantly lower than in healthy women (mean 4,9% vs 8.3%, p< 0.0001). This is also illustrated in 