find and display groups by higher ranking

hi guys,... can anyone help please. 

how can I find groups by higher ranking: 

I have a group table with 'rank" filed in db: e.g.

id rank

66 102 

65 33 

64 77 

63 151

      $groups = $this->Group->find('all', array('conditions' => array('Group.rank' => how to display group with higher ranking on top of others )));

thanks in advance, 

chris

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