▁the ▁sub - S ah aran ▁countries ▁of ▁Africa ▁may ▁be ▁at ▁higher ▁risk ▁of ▁developing ▁E OP . ▁ ▁T in oco ▁ 1 9 9 7 ▁exam ined ▁ 7 8 4 3 ▁children ▁between ▁the ▁ages ▁of ▁ 1 2 ▁to ▁ 1 9 ▁in ▁Brazil ▁with ▁strict ▁clin ical ▁and ▁radi ographic ▁criteria . ▁ ▁A ▁ 0 . 3 % ▁pre val ence ▁of ▁local ized ▁ju ven ile ▁period ont itis ▁was ▁found , ▁with ▁different ▁sub pop ulations ▁exhib iting ▁a ▁range ▁between ▁ 0 . 1 % ▁to ▁ 1 . 1 %. ▁ ▁This ▁study ▁found ▁that ▁L J P ▁was ▁highly ▁associated ▁with ▁Act in ob ac ill us ▁act in om yc et em com it ans . ▁ ▁L ope z ▁ 2 0 0 1 ▁exam ined ▁ 9 , 1 6 2 ▁high ▁school ▁children ▁for ▁clin ical ▁attachment ▁loss ▁in ▁ 6 ▁sites ▁of ▁first ▁and ▁second ▁mol ars ▁and ▁in cis ors . ▁ ▁Over all , ▁C AL ▁> 1 mm ▁was ▁seen ▁in ▁ 6 9 . 2 % ▁of ▁the ▁students ; ▁> 2 mm ▁in ▁ 1 6 % ▁of ▁the ▁students ▁and ▁> 3 mm ▁in ▁ 4 . 5 %. ▁ ▁They ▁noted ▁that ▁while ▁the ▁distribution ▁of ▁C AL ▁was ▁marked ly ▁ske wed , ▁it ▁followed ▁a ▁continu um ▁of ▁disease ▁sever ity . ▁ ▁No ▁sharp ▁distinction ▁exists ▁between ▁period ont al ▁health ▁and ▁disease ▁among ▁Chile an