Table 2. Semiquantitative scores (0–3) of nailfold videocapillaroscopy (NVC) abnormalities of long covid (LC) patients without systemic sclerosis (non-SSc-LC), recovered COVID-19 patients that did not develop LC (RC) and healthy matched controls (CNT).

	Non-SSc-LC patients (n=62)	RC patients(n=23)	CNT(n=84)	P values (univariate)			P values (multivariate)			P values (FDR)
				LCversusCNT	RCversusCNT	LCversusRC	LCversusCNT	RCversusCNT	LCversusRC	LCversusCNT	RCversusCNT	LCversusRC
Time between COVID-19 and NVC examination (months, mean±SD)	17±13	12±7	–	–	–	–	–	–	–
NVC findings
Mean capillary number per linear millimetre (mean±SD)	8.8±1.5	9.9±0.9	10±1.5	<0.01	n.s.	<0.01	<0.01	–	<0.01	<0.01	<0.01	<0.01
Dilated capillaries (0–3) (mean±SD)	1.3±0.7	1.3±0.4	0.7±0.7	<0.01	<0.01	n.s.	<0.01	<0.05	–	<0.01	–	–
Abnormal shapes (0–3) (mean±SD)	0.3±0.6	0.2±0.4	0.2±0.4	<0.05	n.s.	n.s.	<0.05	–	–	<0.05	–	–
Microhaemorrhages (0–3) (mean±SD)	0.5±0.6	0.2±0.4	0.01±0.1	0.01	n.s.	n.s.	<0.05	–	–	<0.05	–	–
Giant capillaries (0–3) (mean±SD)	0±0	0±0	0±0	n.s.	n.s.	n.s.	–	–	–	n.s.	–	–

^*A p- value of ≤0.05 was considered statistically significant (bold in the table). Multivariate analysis included adjustment for age, sex, smoking habit, and comorbidities. Multiple comparisons were corrected using the Benjamini-Hochberg to control the ().

^†Multivariate analysis included adjustment for age, sex, smoking habit, Raynaud’s phenomenon and comorbidities.

^‡Multiple comparisons were corrected using the Benjamini-Hochberg method to control the false discovery rate (FDR).

n.s., non-significant.