Fig. 1

Annual incidences / Age-adjusted annual incidences of acute promyelocytic leukaemia over a 30-year period. The Y axis represented annual incidences for males and females, and age-adjusted annual incidences for different age groups. The actual numbers of patients and the annual incidences / age-adjusted annual incidences for each time period were given under the different analysed groups. Annual incidence was studied until end of 2020, because only three months had elapsed for the year 2021, which was not included in the analysis