Share of the population with basic numeracy skills by birth decade

The shown estimates of basic numeracy are based on the share of people who stated their age correctly. The shown "ABCC-index" is based on the finding that inpopulation with lower numeracy skills "age heaping" occurs more frequently. "Age heaping" refers to the higher frequency of attractive numbers (i.e. rounded numberswhich are multiples of five), which occurs in populations with lower numeracy skills.