| Legend |
| Significantly below average |
1 |
no 99% confidence interval overlap: higher values |
| Below average |
2 |
no 95% confidence interval overlap: higher values |
| Average |
3 |
overlapping 95% confidence intervals, England: 4.85% to 4.96% |
| Above average |
4 |
no 95% confidence interval overlap: lower values |
| Significantly above average |
5 |
no 99% confidence interval overlap: lower values |