An international version of the Students' Tendency to Lose Control Scale was developed consisting of four subscales (20 items) including; tendency to lose control with 1) friends, 2) parents, 3) self and 4) teachers. Participants were Japanese students (n=941) and students from Northern European countries (Denmark, Finland, and Sweden, n=897), aged 10 to 15 years. They responded by choosing one of four choices. Scores were calculated by adding the score for each item. The result indicated that there was no significant difference between Japanese students and Nordic students in the total score. However, there were distinctive differences on the subscales. For example, the direction of anger was different between countries, such that Japanese students had a stronger tendency to lose control with their friends, whereas Nordic students were more likely to lose control with the self. Moreover, girls were more likely to lose control than boys, irrespective of nationality. Further analysis of gender-dependent developmental changes indicated that there was a period when the score rose rapidly in girls, irrespective of nationality (in Japan; 10-11 years old and in north Europe, 11-12 years old). This phenomenon could possibly be an effect of secondary sexual characteristics that cause sudden physical changes in girls.
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