Table 1

Summary of Certificate of Vision Impairment (CVI) certifications with the mean, SD, coefficient of variation and degree of variation

MeanSDCoefficient of variationFold variation
CVI Crude Rate (per 100 000 population)42.9718.100.4212.47
CVI Directly Standardised Rate (per 100 000 population)43.6916.690.3810.79
Programme Spend (in pounds sterling) on Vision (per head of population)32.556.160.192.13
Index of Multiple Deprivation (IMD)*23.638.400.363.67
  • *In 2010 IMD scores ranged from 1.4 to 87.8.14