Table 2.

Cumulative mean predialysis serum β₂M level and dialysis β₂M kinetics

Parameter	Cumulative Mean Predialysis Serum β 2M Levela			Cumulative Mean Predicted β 2M Kt/V a,b
	n	Mean	SD	n	Mean	SD
Entire cohort	1813	37.6	11.9	1826	0.37	0.34
High-flux arm	905	33.6	9.2	910	0.66	0.21
Low-flux arm	908	41.5	12.9	916	0.07	0.07
Prestudy dialysis duration >3.7 yr	569	41.8	11.7	572	0.37	0.33
Prestudy dialysis duration ≤3.7 yr	1244	35.6	11.4	1254	0.36	0.34

^aCumulative values throughout the entire follow-up period including the last available value before death.

^bObtained by multiple regression analysis of the observed values on the type of dialyzer, reuse number, and type of reprocessing method