Fig. 4

a Nailfold capillary end row loop (ERL) density in 140 untreated children with JDM and 46 healthy controls. The dotted line is the mean ± 2 standard deviations (shaded area) for controls. The mean ERL for JDM was 5.0 ± 1.5/mm, vs the mean ERL for healthy controls, 8.0 ± 0.9/mm, p < 0.0001. b The association of a range of MSA with nailfold end row loop capillary density in 94 untreated children with JDM. c Comparison of nailfold end row loop capillary density for 51 untreated children with JDM positive for P155/140 MSA with 43 untreated JDM positive for other MSA or MSA negative, * = significance at 0.05. d The lack of association of a positive antinuclear antibody with a significant difference in the density of the nailfold capillary end row loops