Introduction and objective:
Overweight and obesity in children and adolescents has been one of the major health and social challenges worldwide for several decades. Obesity is a multifactorial disease in which the risk factors may appear with various severity and combinations. The aim of the study was to identify associated factors for childhood obesity and conduct a multivariate analysis.

Material and methods:
The study included a group of 268 schoolchildren and adolescents. The children were assigned to one of two groups: study group – children with overweight and obese, and control group – children with normal weight. Data were collected using questionnaires related to prenatal, biological, environmental, behavioural, and nutritional risk factors for obesity.

Of the examined factors, six proved to be significantly associated with the risk of developing childhood overweight or obesity: gender (<0.05), maternal pre-pregnancy BMI (p < 0.001), maternal BMI (<0.001), lower socio-economic status (SES) (p <0.05), waking time at weekends (p <0.05), and snacking between meals (p <0.05). The results of the multivariate analysis indicate that the chance of a child being overweight or obese was over 6.5 twice as likely if the mother was overweight or obese (OR = 6.564; p <0.001). Male children were approximately twice more likely to become obese or overweight than female children (OR = 2.199; < 0.05). The risk of excess weight was 2.5 times higher in children who ate between meals than in the rest of the group (OR = 2.514; p < 0.05).

Factors related to the mother, and not both parents, have a stronger impact on the development of overweight and obesity in children. Women`s excess body weight at pre-pregnancy is the most significant factor influencing the child`s future high body weight.

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