| [Objective]In this study,1253 infants aged from 1 month to 3 years were examined for bone mineral density and a questionnaire survey was conducted to determine the bone mineral density and its influencing factors in Kunming.[Method]The bone mineral density of patella in infants from 1 month to 3 years old in our hospital for pediatric outpatients was detected by using an ultrasonic bone density meter.At the same time,a questionnaire was used to investigate the age,sex,weight,height,birth status,feeding methods,supplemental food supplement time,vitamin D supplementation time,supplemental dose,and sunshine duration.All data entries were compiled using Excel software and statistical analysis was performed using SPSS21.0 software.[Results]1.Average BMD of infants in 1?6 months is 0.34±1.21,average BMD of infants in 7?12 months is 0.84±1.04,average BMD of more than 12 months old children is 1.40±1.07,after statistical analysis,BMD of infants in 1-6 months is the lowest,BMD of more than 12 months old children is the highest,and the difference was statistically significant(P<0.05).2.Average BMD between male and female groups are-0.09±1.30 and-0.06±1.29,after statistical analysis,there is no significant difference in bone mineral density between male group and female group(P>0.05).3.Average bone mineral density of infants and infants fed by artificial feeding is 0.46±1.00,average bone density of breast-feeding infants is-1.07±1.25,average bone mineral density in mixed feeding group is 0.33±0.98,after statistical analysis,average bone mineral density values of artificial feeding group is higher than those of breastfeeding and mixed feeding,the average bone mineral density of breastfeeding group was the lowest,and the difference was statistically significant(P<0.05).4.Mean bone mineral density of infants with sunshine duration less than 1 hours is-0.86±1.28,the average bone mineral density of infants and young children over 1 hour of sunshine is 0.55 ± 0.90,according to statistical analysis,the average BMD of infants and young children with more than 1 hours of sunshine was higher than that of infants within 1 hours,the difference was statistically significant(P<0.05).5.The addition of vitamin D(more than 400IU)the average infant bone density is 0.29 ± 1.12,no added vitamin D(<400 IU)average bone mineral density is-0.59 ± 1.35,after statistical analysis,the bone mineral density value of infants with vitamin D supplementation was higher than that without vitamin D,the difference was statistically significant(P<0.05).6.Average bone mineral density of infants and young children supplemented with vitamin D(vitamin D ? 400 IU)and sunshine duration more than 1 hour is 0.61 ± 0.84,the average bone mineral density of infants and young children supplemented with vitamin D and the sunshine duration less than 1 hour is-0.43 ± 1.31,after statistical analysis,average bone mineral density values of infants and young children supplemented with vitamin D and having a daylight time of more than 1 hour were higher than those of vitamin D supplemented but less than 1 hour of sunshine time(P<0.05).[Conclusion]1.There is a positive correlation between bone mineral density and age in infants.2.There was no significant difference in BMD between different sexes.3.Low bone mineral density in infant breastfeeding.4.Sunshine time more than 1 hour is beneficial to increase bone density.5.Vitamin D was positively orrelated with bone mineral density in infants.6.Vitamin D supplementation combined with sunlight exposure has higher bone mineral density in infants. |
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