Table 1.

Criteria for the evaluation of clinical efficacy of clotting prevention as evaluated visually by the investigator at the study site at the end of the hemodialysis after the first session and after week 8

Score		Lines and bubble catcher	Dialyser
Satisfactory	0	No clots	Good, clear dialyser
	1	Minimal clots	Light redness overall or only a few (< 3) and small (< 2 mm) dark red fibre bundles
Unstatisfactory	2	Moderate clotting	Moderate redness overall or several (≥ 3) small or few large (≥ 2 mm) dark red fibre bundles
	3	Severe clotting	Total clotting of the dialyser (stop in hemodialysis, requiring change of the extracorporeal circuit).