Center for International Collaboration and Partnership, National Institute of Health and Nutrition, National Institutes of Biomedical Innovation, Health and Nutrition, Japan.
Student Support Center, Seigakuin University, Japan.
Geriatr Gerontol Int. 2017 Oct;17(10):1677-1682. doi: 10.1111/ggi.12956. Epub 2017 Jan 6.
The National Health and Nutrition Survey, Japan, has annually monitored two indicators of physical activity in adults. They are contrasting in the association with age; the prevalence of exercise habit is lower and step counts are higher among younger participants. The present study aimed to examine the effects of rapid aging of the Japanese population and the lower participation rate among younger adults on the short-term trend of two indicators of physical activity using tabulated data.
The prevalence of exercise habit and step counts by age groups (≥20 years) from 2003 to 2010 were estimated using tabulated data from the National Health and Nutrition Survey by calculating sex-specific means weighted by age-specific Japanese population data for each year (population-weighted estimates) and for a fixed year (2005; age-standardized estimates). Linear regression analyses were used to test the statistical significance of their trends.
Statistically significant increasing trends in the prevalence of exercise habit were observed for the crude means (P = 0.029), the population-weighted estimates (P = 0.007) and the age-standardized estimates (P = 0.016) only in men. Statistically significant decreasing trends in the step counts were observed for the crude means (P = 0.006 in men and P = 0.033 in women) and the population-weighted estimates (P = 0.008 in men and P = 0.049 in women) both in men and women, but for the age-standardized estimates (P = 0.039) only in men.
The effects of rapid aging of the Japanese population and the lower participation rate among younger adults on the short-term trend are not small, and age-standardization is necessary to observe even the short-term trend of physical activity data. Geriatr Gerontol Int 2017; 17: 1677-1682.
日本国民健康和营养调查每年监测成年人的两项身体活动指标。它们与年龄的相关性不同；年轻参与者的运动习惯患病率较低，而步数较高。本研究旨在使用表格数据检查日本人口快速老龄化和年轻成年人参与率下降对两项身体活动指标短期趋势的影响。
使用国民健康和营养调查的表格数据，根据每年特定年龄组（≥20 岁）的年龄特异性日本人口数据计算性别特异性平均值（加权平均值），分别估算 2003 年至 2010 年期间年龄组（≥20 岁）的运动习惯患病率和步数。线性回归分析用于检验其趋势的统计学意义。
仅在男性中，粗均值（P=0.029）、加权平均值（P=0.007）和年龄标准化估计值（P=0.016）观察到运动习惯患病率呈统计学显著增加趋势。仅在男性中，粗均值（P=0.006 男性和 P=0.033 女性）和加权平均值（P=0.008 男性和 P=0.049 女性）观察到步数呈统计学显著下降趋势，但年龄标准化估计值（P=0.039）仅在男性中观察到。
日本人口快速老龄化和年轻成年人参与率下降对短期趋势的影响不可忽视，即使是身体活动数据的短期趋势也需要进行年龄标准化。老年医学与老年病学国际 2017；17：1677-1682。
