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Association of fibrosis score with post-transplant interval by linear regression analysis. For calculation of the regression lines, it was assumed that fibrosis was absent at the time of transplantation (time zero biopsies were available for a minority). The gradient of the regression line for liver biopsies performed for recipients with a donor age greater than 40 was 0.79 fibrosis units per year and for those less than 40 years 0.26.
