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Weight disorders are rapidly increasing in childhood. In Italy a strong geographic North-South gradient of overweight and obesity has been reported. The purpose of this study is to examine anthropometric variables, physical activity and lifestyles in school-age children in the cities of Bologna and Crotone. The sample consists of 963 children attending primary schools, aged 6–10 years. Height, weight, triceps, and subscapular skinfolds were measured for each child; body mass index (BMI) and percentage of fat mass were calculated. Physical activity was determined through an interview with each child. Another questionnaire was submitted to parents, in order to obtain information on sleep duration, means of transport and type of physical activity. In the city of Bologna, the mean values of anthropometric variables were: height (boys – 1335 mm, girls – 1332 mm), BMI (boys – 17.8 kg/m 2 , girls – 17.3 kg/m 2 ), and the proportion of overweight and obese individuals was: boys – 20.6%, girls – 12.7%. In Crotone the mean values were: height (boys – 1275 mm, girls – 1265 mm), BMI (boys – 19.4 kg/m 2 , girls – 19.3 kg/m 2 ), and the proportion of overweight and obese individuals was: boys – 46.7%, girls – 49.0%. The results have demonstrated significant correlations of lifestyle and physical activity with children's weight status. In Crotone there is a larger variation of weight disorders with higher percentages of overweight children than in Bologna. The children in Crotone are engaged in sedentary activities for a significantly longer time than children in Bologna, who are more physically active. The data show a strong North-South gradient concerning not only distribution of weight status, but also lifestyles especially including participation in sports and sedentary behavior. Our study also provides meaningful suggestions how to define lifestyles in order to achieve an optimal health status during growth. [ABSTRACT FROM AUTHOR]