The purpose of this study is to clarify relations between syntactic structures of a language, especially word order structures, and people's thought patterns who use it as a native language. From World Atlas of Language Structures' database, we get word order feature values of 73 languages for 13 word order features. Suicide rate and homicide rate are used as quantitative parameters of human thought pattern. From the WHO's database (mortality and burden of disease estimates for WHO member states in 2004), we get the suicide rate and the homicide rate data for 192 countries. The result of a t-test shows a significant relationship between "order of adjective (A) and noun (N) (AN order or NA order)" and suicide rate with 1% significance level. Adding non-linguistic features: an economic feature (GDP per capita) and climate features (average annual temperature and average annual precipitation), we conduct multiple regression analyses. Results show a significant relationship between "order of adjective and noun" and suicide rate with 1% significance level. AN order language speakers tend to have higher suicide rate than NA order language speakers. Results also show significant relationship between "order of object (O) and verb (V)" and homicide rate with 10% significance level. OV order language speakers tend to have lower homicide rate than VO order language speakers.
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