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                           :     ̾ ,   ϱ  | 
                 
                 
                     Ҿƺ κ   ,    ֿ ̴. Ҿƺ 70~80% κ ̾  索, ,  ȯ  ɰ պ ʷѴ. ֱ ǥ     ̾   а û ݷ ġ,  ߳ ɷ Ѵ.
 
  
  ɶ б Juuso Hakala ڻ    ߳   ȯ ڿ ߳ ɷ   ߴ.  3~18  3,596 1980 31Ⱓ ߴ. ɷ ˻翡 34~49  2,206 ߴ.  ȯ ڰ Ǹ ȭ  нɷ,  ðóɷ,  Ƿ,   ð ɷ ϵǴ  (inverse association) Ÿٰ . ȭ ſ ߴ ȭ Ե , нɷ ڱذ ڱ Ȥ  ڱ  ݺ нϴ ɷ,  Ƿ  ߷̶ Ҹ ɷ̴. ȯ   а û ݷ ġ     ̷ ġ  ߳ ȭ° нɷ Ͽ  ־.ü  ɷ Ͽ  ־. ü ߴ      ̾   ó ɷ°  Ƿ ߴ.  ġ ֿο  ġ ϴٴ    ӻ   ߺ ߴ   ǰ  ٽɡ̶ ϸ ̹  ߰ߵ  ΰ̶  ȯ ڿ  ġ ǰ   ȸ  ̶͡ ٿ.̹  10(ð) м Circulation Ǿ, ̱ ǰ  Ʈ HealthDay ߴ.
 
 
 
 
  , ۽±   ü    ִ   Ұߴ. ۽±  ο ġ, ̵  ġ, ο  Ŭ̹,  ű  Ʈ 20ȸ  Ʈ ϰ   ѷ ̿   ̿  õߴ. = ۽± 
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