Background. There is no doubt about the aggressiveness increase in the population. All mass-media keep informing us about this problem. Based on the project ELSPAC data we considered participation in a brawl as an expression of aggressiveness and estimated its gravity depending on the place of treatment. From the information given in the questionnaire (wide variety of information about the respondent’s family, upbringing, health and psychic condition) we searched for relationships between these injuries and their gravity. Methods and Results. 894 men out of 4,5 thousand ELSPAC study participants in Brno and the Znojmo district gave information about their injuries from brawls and they also stated if they were treated with the injury on the hospital bed, as an outpatient or only at home. The vast majority of the injuries happened between their 16th – 18th year of age. Conclusions. Dysfunctional family, ineffective upbringing, scholarity defects, low education, higher morbidity in the personal history together with the higher up-to-date accident rate of the respondent and his family members were assessed as factors associated with brawl injury occurence. The injury gravity was however less often associated with these factors than the injury occurence.

        Key words: aggressiveness and family, aggressiveness and injury, brawl injuries, male aggressiveness, child aggressiveness, aggressiveness and stress, aggressiveness and education, aggressiveness and school.