Table III.

Variables included in the regression models

Predictors	Dependent variables
Patient factors	Joint fluid Co†
	Joint fluid Cr†
Age at primary
Gender*
Bilateral devices*
Cellular environment:
ALVAL grade*
Agglomerated particle grade*
Device factors:
Total volumetric wear rate†
Duration in vivo
Dilutional effects:
Acetabular component size
Fluid grade*

^*categorical variables

^†log normalized values used in the analysis

Co, cobalt; Cr, chromium; ALVAL, aseptic lymphocyte-dominated vasculitis-associated lesion