Figure 1. Plasma factor B levels. The plasma factor B (FB) concentration in samples from 119 patients with age-related macular degeneration (AMD) and 152 controls was determined with enzyme-linked immunosorbent assay (ELISA; A). The AMD patient group was made up of 46 men and 73 women. In the control group, 51 were male and 101 female (B). FB levels are also classified according to factor H (FH) polymorphism (C) and age (D). *p<0.05.