ȭ Ǽ, ϰȮǽ
ȭ ǼҴ ߰ ġ ̰ ε ǰ ϵ ȯ Ƿ ǽϰ ִٰ . ϰ ڴ Ƿޱڿ ǰ ǰ ΰ 50% شϴ ڷ 5Ͽ ִ. 7ʹ ϰ ߰ 54~74 30( 1 30 Ǵ 2 15) ̻ ڴ 2⸶ ְ Ǿ. ˰ к˻ ؼϰ 峻ð 1 ˻ ϴ ù ǽ ȹ̴. ̿ "ϰ ϴ ߰ ġ 90% ̻ ġ ϹǷ ߰ ߿ϴ" ߴ.