Introduction: Balance is an important motor skill that helps maintain body stability during standing and movement. It is essential for performing everyday activities. In the early primary school period, balance is still developing and can be influenced by various factors, such as sex, body mass index (BMI), and physical activity. Purpose: The aim of the master's thesis was to evaluate static and dynamic balance in first- and second-grade primary school children and to determine whether balance test results differ according to sex and BMI category, and whether they are associated with the weekly amount of organized physical activity. Methods: A cross-sectional quantitative study included 99 children aged between six and eight years from two different primary schools in Ljubljana. Static balance was assessed using the one-leg stance test under three conditions (eyes open on a stable surface, eyes closed on a stable surface, and eyes open on an unstable surface). Dynamic balance was assessed using the beam walking test. Data on age and organised physical activity were collected using a questionnaire, while anthropometric characteristics were obtained through measurements. Statistical analysis was performed using the Mann–Whitney U test and Spearman's correlation. Results: Girls achieved significantly better results in the static balance test with eyes open on a stable surface (p = 0.009) and on an unstable surface (p = 0.006). No significant sex differences were found in the eyes-closed condition or in the dynamic balance test. There were also no significant differences in balance test results according to BMI category or participation in organized physical activity. Furthermore, no significant correlations were found between BMI or weekly amount of organized physical activity and any of the balance test results. Discussion and conclusion: Sex differences in first- and second-grade primary school children were found only in specific static balance tasks, while no associations were found between balance, BMI category, and organized physical activity. The results are consistent with findings from some previous studies; however, further research involving the Slovenian population is needed, using a more representative sample and more specific measures of children's physical fitness.
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