Table 3.

Alkaline phosphatase (AP) reactivity of muscle microvasculature in muscle from patients with dermatomyositis (DM), other idiopathic inflammatory myopathies, noninflammatory myopathies (NIM), and healthy muscle. Values are the mean ± SD.

	DM, n = 45	Polymyositis and Inclusion Body Myositis, n = 13	NIM, n = 26	Healthy, n = 27
AP+ capillaries/mm²	8.8 ± 6.7^†	4.3 ± 2.6^*	6.2 ± 5.5	3.0 ± 1.4^*
AP+ capillaries/muscle fiber	0.042 ± 0.030^†	0.022 ± 0.014	0.036 ± 0.039	0.020 ± 0.0^*
AP+ capillaries/total capillaries	0.045 ± 0.038^†	0.020 ± 0.016	0.017 ± 0.012^*	0.011 ± 0.008^*

↵* p < 0.05 compared to DM;
↵† p < 0.05 compared to healthy muscle.