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Linear regression analysis of the retinal nerve fibre layer thickness and age for white and Afro-Caribbean groups. R = 0.6499, R2 = 0.4224, SE 8.20026, p < 0.001, n = 59 for whites and R = 0.7588, R2 = 0.5758, SE 6.37953, p < 0.001, n = 51 for Afro-Caribbeans.
