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??????????????????????????????????????????????????????????? 2002 ?? 2011 ????????????? 250 ????????????????????????????????????????????? 250 ?????? 176 ???? 74 ????? 223 ????? 1 ?? 86 ?????????? 33.4 ± 15.3 ??18 ? 29 ??????????????? 223 ???170 ??????53 ???? 17 ????????????????46%?115/250?????18%?45/250?????????????3.6%?9/250?????????????32.4%?81/250??87?????????????118?????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
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