Objective To evaluate the vitamin D (VitD) nutritional status,and to investigate the interaction of 25-hydroxy-vitamin D [25(OH)D] and outdoor activities time and the body mass index in 0~6 years old children. Methods Utilizing a stratified random cluster sampling design,a total of 5 289 healthy children aged 0~6 years old were recruited from 12 regions of Jiangsu province.Anthropometric indices:weight,height,VitD levels were estimated by ELISA,and the related questionnaire investigation was carried. Results 1)The means and standard deviations of serum 25-(OH)D levels was (66.59±30.27)nmol/L,65.6% had VitD deficiency,VitD overdose and poisoning cases were not found.The level of 25-(OH)D was significantly higher in 0~2 years old group.2)When children's age,gender and other variables were adjusted,outdoor activities time and the BMI were correlated with the serum 25-(OH)D levels (P<0.01),Daily time for outdoor activities up to 4 hours had best VitD level (F=11.45,P<0.05).The research objects receiving physical examination were screened by BMI(BMI>P 97th was the standard for obesity).In the study with 409 cases of obese children,the 25-(OH)D concentration increased with BMI(F=4.168,P<0.05).In addition,the serum 25-(OH)D levels in obesity and normal group were (65.94±29.56)nmol/L and (66.65±30.34) nmol/L,and this difference was not significant(t=0.454,P=0.650). Conclusions There is a high prevalence of VitD deficiency in 0 to 6 year olds in Jiangsu province,especially for children over 2 years of age.The average VitD levels among children more exposed to sunlight is sufficient.When it is not up to the obesity standard,there is a positive correlation between 25-(OH)D levels and BMI.
Key words
outdoor physical inactivity /
body mass index /
children /
vitamin D
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