The post you are reporting:
Table 13: 95 per cent confidence intervals for key statistics, 2016/17
Gross income Disposable income
Lower bound Published estimate Upper bound CV Lower bound Published estimate Upper bound CV
All households Gini coefficient (%) 34.5 35.4 36.4 1.4 31.3 32.0 33.0 1.5
Median equivalised disposable income (£ per year) . . . . 26,569 27,310 28,050 1.4
Mean (£ per year) 42,505 43,645 44,784 1.3 34,410 35,247 36,085 1.2
Bottom quintile1 (mean, £ per year) 13,720 15,331 16,942 5.3 12,120 13,392 14,663 4.8
Top quintile1 (mean, £ per year) 87,507 92,042 96,576 2.5 67,360 70,684 74,009 2.4
What figures are you citing?