Capillaroscopy in Psoriatic and Rheumatoid Arthritis: A Useful Tool for Differential Diagnosis

Table 3

Morphometric study results.

	Venous limb diameter	Arterial limb diameter	Loop diameter	Loop amplitude	Linear density (Loops/2 mm)	Tortuosity (Twisted capillaries/4 mm)
Pso	17.6 μm ± 5.2	15.3 μm ± 4.3	26.8 μm ± 6.3	42.2 μm ± 10.3	13.2 ± 2.1	10.5 ± 2.1
PsA	18 μm ± 5.4	15.1 μm ± 3	27.2 μm ± 7.1	40.4 μm ± 9.1	13.1 ± 1	12.2 ± 3.2
RA	22 μm ± 4.1	16.2 μm ± 4.1	30 μm ± 8	56 µm ± 12	16 ± 2	7.1 ± 1.2
Controls	17.5 μm ± 3.1	14 μm ± 3.2	26.4 μm ± 5	46.1 μm ± 10	16.4 ± 2.6	6.2 ± 1.1
Pso versus controls	N.S.	N.S.	N.S.	𝑃<0.001	𝑃<0.001	𝑃<0.001
PsA versus controls	N.S.	N.S.	N.S.	𝑃<0.001	𝑃<0.001	𝑃<0.001
RA versus controls	𝑃<0.001	𝑃<0.001	𝑃<0.001	𝑃<0.001	N.S	N.S.
PsA versus RA	𝑃<0.001	𝑃<0.05	𝑃<0.001	𝑃<0.001	𝑃<0.001	𝑃<0.001
Pso versus RA	𝑃<0.001	𝑃<0.05	𝑃<0.001	𝑃<0.05	𝑃<0.001	𝑃<0.001
Pso versus PsA	N.S.	N.S.	N.S.	N.S.	N.S.	N.S.

Data are expressed as mean ± SD.
Statistical significance was assessed with Student’s 𝑡-test; significance was set at 𝑃<0.05.