English to French Science Biology (-tech,-chem,micro-) Food safety

Dans un descriptif d'étude:

" Design:
Patients were first asked to consume a margarine without PS for a period of 5-week (run-in period).
They were then randomly allocated to one of the 3 following groups: the 1st group continued with the control margarine, the second one with a plant sterol-enriched margarine (2.5 g plant sterols/d) and the 3rd group with a plant stanol-enriched margarine (2.5 g plant stanols/d). They were asked to consume their margarine for 85 weeks.
Blood samples were collected at week 4-5 and 89-90. Cholesterol blood levels and lutein/zeaxanthin concentrations were analysed.
Moreover the Macular Pigment Optical Density (MPOD), which is a marker of ARMD, was measured at week 5 and week 90.
Data on 47 subjects were available for analysis.

 Results:
A reduction in ***cholesterol-standardized serum lutein/zeaxanthin concentrations*** was observed at the end of the study compared to baseline."

Pour l'expression entre ***, je crois saisir de quoi il s'agit, mais je ne connais pas d'expression "consacrée" équivalente en français. Je ne trouve pas non plus de formulation à moitié claire et fluide.
Si quelqu'un à une idée, je le remercie pour son aide.