This paper examines mobility and changes in Body Mass Index (BMI) for a sample of Irish children/adolescents across three waves of the longitudinal Growing Up in Ireland dataset. Particular attention is paid to transitions across the key BMI thresholds of overweight and obesity. Analysis is carried out by gender and by maternal education. In general, mobility is observed, with intra-generational rank-rank BMI coefficients of around 0.63 compared to coefficients of around 0.77 for the mothers of the children over the same time period. Across the distribution as a whole there is relatively little variation by gender and maternal education. However there a gender difference in terms of mobility out of obesity with the Shorrocks mobility index across categories of normal weight/overweight/obesity taking a value of 0.56 for females as opposed to 0.71 for males. This relative lack of mobility is more observed in later rather than earlier adolescence.

本文研究了爱尔兰数据集的三个纵向增长阶段中的爱尔兰儿童/青少年样本的流动性和身体质量指数（BMI）的变化。特别注意超重和肥胖的关键BMI阈值的转变。通过性别和孕产妇教育进行分析。通常，观察到流动性，代内等级BMI系数约为0.63，而同一时期儿童母亲的系数约为0.77。在整个分布中，性别和孕产妇教育的变化相对较小。但是，在肥胖方面，Shorrocks的活动指数在正常体重/超重/肥胖类别中的性别差异存在差异，女性为0.56，而不是0。男性71。这种相对缺乏活动性的现象在青春期后期而不是青春期前更为明显。