Further detail on the demography of centenarians and the KT method can be found in Thatcher, R. This time lag reflects the availability of the data sources and the time required to process the data and calculate the estimates. Figure 1: Unconstrained KT estimates for the most recent years are less accurate than for further back in time Unconstrained Kannisto—Thatcher 90 years and over estimates as a percentage of mid-year estimate 90 years and over totals, UK, to These feed into our UK estimates. The KT method usually produces lower estimates of the total population aged 90 years and over than the official mid-year estimate. Estimates of the very old are calculated from death registration data using the Kannisto—Thatcher KT method; they are constrained to the age 90 years and over totals in the official published MYEs. In recognition of this, we began publishing these estimates in Estimates of the very old, including centenarians, QMI Quality and Methodology Information report for annual mid-year population estimates for the very old, detailing the strengths and limitations of the data, methods used, and data uses and users. These statistics provide estimates of those aged 90 years and over by sex and single year of age up to age years and for the years and over age group for England, Wales and the UK.
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