Figure 2

Right 2D and 4D finger means to age: right 2D finger means to age in total sample (a), right 4D finger means to age in total sample (b), right 2D finger means to age in three populations (European origin (c), African origin (d), Asian origin (e)), right 4D finger means to age in three populations (European origin (f), African origin (g), Asian origin (h)).