What is the age definition used in producing the results?
The CMI analyses use an initial exposed to risk and an age definition of age nearest. The principal table we use for comparisons is CIBT93, which was originally contained in A Critical Review, presented to SIAS in 2000. There has been some confusion as to the age definition that should be assumed for CIBT93. Although paragraphs 3.1.2, 3.10 and 4.3.3 of the paper state that CIBT93 is age exact, this appears to be contradicted by the details of an experience investigation in section 4. Using a census method to calculate exposure, there are two distinct groups of lives, one aged x nearest at the start of the year and one aged x nearest at the end of the year. Hence lives are aged x nearest, on average, throughout the year and qx-½ (rather than qx) is required, assuming an age exact table. However the paper states that no adjustment has been made to CIBT93 where it is applied to (in force) data with an age definition of age nearest at 31 December. Consultation with the authors has also con
