1. Purpose This study has focused on response rates of the questionnaire which considered as a basic data to identify constitution for American. 2. Methods By analysing the tendency of the respondents who has defined constitution by clinical diagnosis and comparing of their answers, the result of their constitution analysis by our questionnaire were re-examed. The answer of each question to each constitution were tested how it is relevent to a scale of a constitution. Each item response rate on SF_SSCQ-A was analysed about those who had been tested and diagnosed as Taeyangin, Soyangin, Taeeumin, Soeumin respectively. 3. Results There were the 55 significant items; 13 Taeyangin items, 13 Soyangin items, 20 Taeeumin items, 9 Soeumin items. However, there were the 11 low response rate items (below 10 %) and 4 no response items.