Table 2.

Vascular stage of workers with HAVS in 1994 (n = 27) by year of investigation

	1994	2017
SWS stage: 0/1/2/3/4 (n)a	11/9/6/1/0	18/4/4/1/0
SWS score (SD)	0.5 (0.5)	0.6 (0.9)
WF attacks by category (n)b	14/1/2/4/4/2/0	17/2/0/5/3/0/0
Photoplethysmography score (minutes) (SD)	6.9 (7.6)	9.7 (7.1)
Difficulties at work or during leisure activities due to WF (n)	8	9

Continuous variables are presented as the mean (SD), and categorical variables are presented as numbers. WF, white finger.

^aSWS: Stage 0: no symptoms (including increased cold sensitivity); Stage 1: VWF attacks affecting only the tips of one or more fingers; Stage 2: VWF attacks affecting the distal and middle pulp spaces of one or more fingers; Stage 3: VWF attacks affecting all three pulp spaces (distal, middle and proximal) of most fingers; Stage 4: attacks that involved trophic skin changes at the finger tips.

^bCategories for the number of VWF attacks/year: 0/1–5/6–20/21–50/51–100/100–365/>365.