Summary of Certificate of Vision Impairment (CVI) certifications with the mean, SD, coefficient of variation and degree of variation
| Mean | SD | Coefficient of variation | Fold variation | |
|---|---|---|---|---|
| CVI Crude Rate (per 100 000 population) | 42.97 | 18.10 | 0.42 | 12.47 |
| CVI Directly Standardised Rate (per 100 000 population) | 43.69 | 16.69 | 0.38 | 10.79 |
| Programme Spend (in pounds sterling) on Vision (per head of population) | 32.55 | 6.16 | 0.19 | 2.13 |
| Index of Multiple Deprivation (IMD)* | 23.63 | 8.40 | 0.36 | 3.67 |
*In 2010 IMD scores ranged from 1.4 to 87.8.14