Relationship between body mass index, waist circumference and waist circumference height ratio and bone metabolism markers in Yinchuan middle school students / 中国学校卫生

ABSTRACT

Objective@#To analyze the relationship between body mass index (BMI), waist circumference (WC), waist to height ratio (WHtR) and bone metabolism markers.@*Methods@#By using the method of cluster sampling, a total of 1 084 adolescents aged 12 to 18 from one middle school in Yinchuan were investigated by questionnaire, physical examination and laboratory examination during sept. to Dec., 2018.@*Results@#BMI, WC and WHtR were significantly negatively correlated with Ca (r=-0.10, -0.15, -0.15, P<0.05), and WC was negatively correlated with β-CTX(r=-0.06 P<0.05). After adjusting for age, sex and vitamin D supplementation, WC had significant effects on Ca and β-CTX(β=-0.33, -0.22, P<0.05). Logistic regression analysis showed that there was no significant relationship between different types of obesity and the level of OC(P>0.05). The level of serum β-CTX in obese students was 1.93 times higher than that in normal students, Ca serum levels of obese students was 0.31 times higher than that in normal students that in abdominal obese students (defined as WC) was 0.54 times higher than that in normal students.@*Conclusion@#BMI, WC and WHtR were correlated with OC, β-CTX and Ca in adolescents in Yinchuan city, and WC was more closely related to Ca and β-CTX, suggesting that obesity has a negative effect on bone absorption.