▁would ▁be ▁expected ▁to ▁show ▁this ▁degree ▁of ▁loss . ▁- ▁black s ▁has ▁twice ▁the ▁inc idence ▁density ▁of ▁whites ; ▁males ▁> ▁females . ▁ ▁Gilbert ▁ 2 0 0 5 ▁describes ▁a ▁pros pective ▁study ▁of ▁persons ▁in ▁Florida ▁> ▁ 4 5 ▁years ▁old . ▁ ▁In - person ▁inter views ▁and ▁exam in ations ▁were ▁conducted ▁at ▁bas eline ▁and ▁ 4 8 ▁months . ▁ ▁The ▁study ▁size ▁was ▁ 5 6 0 ▁persons ▁and ▁at ▁the ▁ 4 8 - month ▁exam ination , ▁ 2 2 % ▁of ▁persons ▁and ▁ 1 . 8 % ▁of ▁teeth ▁had ▁attachment ▁loss ▁inc idence . ▁ ▁Early ▁On set ▁Period ont itis ▁Al band ar ▁ 2 0 0 2 ▁exam ined ▁ 6 9 0 ▁school ▁at ten de es ▁aged ▁ 1 2 – 2 5 ▁years . ▁ ▁They ▁found ▁that ▁ 2 . 3 % ▁had ▁generalized ▁E OP ▁and ▁ 4 . 2 % ▁had ▁local ized ▁E OP . ▁ ▁This ▁total ▁of ▁ 6 . 5 % ▁contrast ed ▁with ▁ 1 . 8 % ▁for ▁Niger ia , ▁ 3 . 1 – 3 . 7 % ▁for ▁Brazil , ▁ 6 . 8 % ▁in ▁India ▁and ▁ 8 % ▁in ▁Sud an . ▁ ▁The ▁pre val ence ▁in ▁C au cas ian ▁populations ▁is ▁in ▁the ▁ 0 . 1 % ▁to ▁ 0 . 2 % ▁range ▁and ▁may ▁indicate ▁that ▁subjects ▁origin ating ▁from