▁ad oles c ents . ▁ ▁Le vin ▁ 2 0 0 6 ▁studied ▁ 6 4 2 ▁young ▁Isra eli ▁army ▁rec ruits ▁( 5 6 2 ▁men ▁and ▁ 8 0 ▁women ) ▁– ▁clin ical ▁period ont al ▁exam ination ▁of ▁four ▁first ▁mol ars ▁and ▁eight ▁in cis ors ▁and ▁radi ograph s ▁were ▁completed . ▁ ▁Ag gress ive ▁period ont itis ▁was ▁found ▁in ▁ 5 . 9 % ▁of ▁the ▁subjects ▁( 4 . 3 % ▁local ized ▁and ▁ 1 . 6 % ▁generalized ). ▁ ▁This ▁was ▁significantly ▁associated ▁with ▁current ▁sm oking ▁and ▁eth nic ▁origin ▁( N orth ▁African ). ▁ ▁E res ▁ 2 0 0 9 ▁exam ined ▁ 3 , 0 5 6 ▁students ▁between ▁the ▁ages ▁of ▁ 1 3 ▁to ▁ 1 9 ▁years ▁at ▁public ▁schools ▁in ▁Turkey . ▁ ▁Their ▁mouth s ▁were ▁c oded ▁according ▁to ▁the ▁recommend ations ▁of ▁the ▁CP IT N ▁( Comm unity ▁Period ont al ▁Index ▁of ▁Tre at ment ▁Ne eds ). ▁ ▁Among ▁the ▁ 3 , 0 5 6 ▁students ▁screen ed , ▁ 1 7 0 ▁were ▁scheduled ▁for ▁further ▁exam ination ▁and ▁ 1 8 ▁were ▁diagn osed ▁with ▁local ized ▁ag gress ive ▁period ont itis . ▁ ▁Thus , ▁the ▁pre val ence ▁of ▁L Ag P ▁was ▁ 0 . 6 % ▁with ▁a ▁female ▁to ▁male ▁ratio ▁of ▁ 1 . 2 5 : 1 . ▁ ▁To oth ▁loss