Table 3

Mean retinal nerve fibre layer (RNFL) thickness (μm)by age groups in white and Afro-Caribbean groups

Age groupWhite (n)Afro-Caribbean (n) RNFL WhiteRNFL Afro-Caribbean p Value*
(mean (1 SD))(range)(mean (1 SD))(range)
11592.5 (5.5)83.5–97.9
24395 (5.3)  87–98.680.4 (5.8)75.5–86.50.05
38984.7 (5.4)78.2–92.475.2 (5.9)67.3–84.10.01
451284.5 (14.1)60.3–96.974.2 (6.2)63.5–84.00.06
58182.1 (10.5)72.2–105.3
612974.4 (4.5)68.6–81.069.8 (6.4)59.3–77.60.11
79882.5 (9.6)68.2–97.666 (4.9)61.1–75.7<0.001
812469 (3.6)63.7–77.560.6 (5.6)55.4–68.20.02
  • Measurements are derived from retardation measurements, 1 degree retardation corresponds to approximately 7.4 μm.*Mann–Whitney U test for the comparison of groups.