Psychiatry and Psychology Research Center, Tehran University of Medical Sciences, Tehran, Iran.
Department of Nutritional Neuropsychiatry, Psychiatry and Psychology Research Center, Tehran University of Medical Sciences, Tehran, Iran.
Child Obes. 2020 Jan;16(1):34-43. doi: 10.1089/chi.2019.0107. Epub 2019 Oct 10.
Previous attempts to create national BMI curves for Iranian children and adolescents were limited to local databases. The objective of this study was to build national BMI growth charts for children and adolescents and to report the key percentiles and national cutoff points based on the data obtained from all provinces of Iran. We also aimed to compare our BMI curves to WHO and CDC curves. In each province, about 1000 children and adolescents (6-18 years) were randomly selected from the urban and rural areas by the multistage stratified cluster sampling method. Across the entire country, 240 trained researchers visited the participants' homes. After obtaining consent forms, these researchers gathered the demographic data, accurate anthropometrics, and BMI measurements. In the data screening and data cleaning levels, the outliers were removed. Then the data sets were smoothed using the log-transformation method. After this, they were converted to -scores based on normal distribution and then transformed back to the original scale. Finally, these data sets were used to determine each percentile. A total of 22,718 final cleaned data were analyzed, including 10,921 (48.1%) boys and 11,797 (51.9%) girls. The normal BMI curves of Iranian children and adolescents and comparison to the WHO and CDC curves are presented here. This study introduces the new cutoff points for categorizing Iranian children and adolescents as underweight, normal, overweight, or obese, based on a large-scale national survey. The fifth BMI percentiles in Iranian boys and girls were significantly lower compared to WHO and CDC fifth percentile. Also, the 95th percentile curve in our study was significantly lower than the CDC 95th percentile curves in boys and girls.
先前针对伊朗儿童和青少年建立全国性 BMI 曲线的尝试仅限于当地数据库。本研究旨在建立全国性的儿童和青少年 BMI 生长图表，并根据伊朗所有省份的数据报告关键百分位数和全国截断点。我们还旨在将我们的 BMI 曲线与世界卫生组织 (WHO) 和疾病控制与预防中心 (CDC) 的曲线进行比较。在每个省份，通过多阶段分层聚类抽样方法，从城乡地区随机抽取约 1000 名 6-18 岁的儿童和青少年。在全国范围内，240 名经过培训的研究人员走访了参与者的家庭。在获得同意书后，这些研究人员收集了人口统计学数据、准确的人体测量数据和 BMI 测量数据。在数据筛选和数据清理阶段，删除了异常值。然后使用对数转换方法对数据集进行平滑处理。在此之后，将它们转换为基于正态分布的 -分数，然后转换回原始尺度。最后，使用这些数据集确定每个百分位数。共分析了 22718 个最终清理后的数据，包括 10921 名（48.1%）男孩和 11797 名（51.9%）女孩。这里呈现了伊朗儿童和青少年的正常 BMI 曲线，并与世界卫生组织和疾病控制与预防中心的曲线进行了比较。本研究根据一项大规模的全国性调查，介绍了将伊朗儿童和青少年归类为消瘦、正常、超重或肥胖的新截断点。与世界卫生组织和疾病控制与预防中心相比，伊朗男孩和女孩的第五个 BMI 百分位数明显较低。此外，我们研究中的第 95 个百分位曲线在男孩和女孩中明显低于疾病控制与预防中心的第 95 个百分位曲线。
