Objective To analyze the characteristics of body composition development of preschool children aged 4-6 years in Jinan,and to study the relationship between body fat percentage (PBF) and body mass index (BMI) in preschool children,in order to compare the difference on obesity diagnosis between PBF and BMI. Method Totally 1 788 healthy children aged 4-6 years in Jinan City were selected for body composition test by bioelectrical impedance method from May 2017 to June 2018. Results The partial body composition of boys and girls before 4-6 years old increased with age. The difference was statistically significant in muscle mass,trunk muscle mass,fat-free body weight,protein,body fat,inorganic salt,basal metabolic rate moisture and PBF(P＜0.05). In Pearson test, BMI was correlated to PBF (r=0.841) if gender was not distinguished,and the correlation coefficient was 0.872 for boys while 0.830 for girls. There was a strong consistency between PBF and BMI in evaluating the obesity rate of children(Kappa=0.64). Conclusions 1)Bioelectrical impedance method can objectively reflect body fat content and accurately evaluate obesity in preschool children. 2) When BMI and PBF were used to assess obesity,the consistency in boys was higher than that in girls. PBF was more sensitive than BMI in assessing obese boys.
Key words
body composition /
body weight /
body mass index /
percentage of body fat /
obesity
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