Dynamics of the adult abnormality rate (aAR) of the P generation from 7 localities in 2011–2013. (a) The aAR changes over time in 3 years. Statistically significant differences are indicated between the fall of 2011 and the fall of 2013 (p = 0.0011, Scheffe test) after the exclusion of Mito. The total number of individuals collected in the 7 localities (n) and the expected number of generations after the nuclear accident are shown. (b) Cluster analysis with a heat map. The cluster of Fukushima and Motomiya (FM cluster) and that of other localities (HTIT cluster) are indicated. Additionally, the cluster of the fall of 2011 and the spring of 2012 and that of other time points are indicated. Mito is positioned as an outlier. (c) The aAR changes of the FM and HTIT clusters over time. The aARs from other localities that can be considered non-contaminated are shown for comparison. Statistically significant differences among time points in multiple comparisons are indicated (p = 0.037, Friedman test). The total numbers of individuals collected in all localities, including the ones from non-contaminated localities (n), are indicated.