Meaning of blood test score (in grey rectangles) in different Metavir fibrosis (F
) stages within the same class of fibrosis class classification. Example of FM2 and FM1 stages in FibroMeter3G in population #2. Sectors correspond to patient proportions. The figures on the top of the external circle reflect the values (mean ± SD) of the blood test score for a single FM stage. The significant difference between FM stages of contiguous classes was mathematically expected contrary to that observed within a single class.