Nationwide polls were conducted from September 29 to October 6 of the same year through individual interviews with 10,000 men and women over the age of 20 (valid respondents: 8,700) by researchers of Central Research Services, Inc.
同年9月29日から10月6日まで全国の20歳以上の男女1万人を対象（有効回収票8,700）、社団法人中央調査社の調査員による面接聴取。