RESUMO
Objective@#The development status and characteristics of height and weight of Japanese, Han and Mongolian students aged 7-18 years in Inner Mongolia in 2014 were analyzed, to explore the ethnic differences in the maximum growth age of height and weight.@*Methods@#The height and weight data of Chinese Han nationality and Mongolian students were from the "2014 survey on the physical fitness and health of students in Inner Mongolia autonomous region". Data on Japanese students were obtained from the "statistical information of the Heisei 26 annual sports survey" of Ministry of Education, Culture, Sports, Science and Technology-Japan. The total increase in height and weight, the average increase in height and weight, and the maximum age of growth were calculated, and the ethnic differences of each index were examined.@*Results@#The average height of Han urban boys was 3.02 and 4.09 cm higher than that of Mongolian and Japanese, the height of Han urban girls was 2.34 and 3.99 cm higher respectively. The average height of boys and girls in rural areas of the Han nationality was 1.26 and 1.69 cm higher than that in Japanese (P<0.05). The average weight of urban Han boys was 2.36 and 5.92 kg higher than that of Mongolian and Japanese, Mongolian was 3.55 kg higher than Japanese. The average weight of Han and Mongolian urban girls was 4.12 and 3.99 kg higher than that of Japanese. The average weight of Han and Mongolian boys in rural areas was 2.48 and 1.55 kg higher than that in Japan. The weight of girls in the Han and Mongolian in rural was 1.53 and 2.24 kg higher than that in Japan respectively (P<0.05). Among the three ethnic groups, urban han boys(10.52 years old), urban Japanese girls (9.69 years old), rural Japanese boys (11.51 years old) and rural Japanese girls (9.71 years old) appeared earlier than other ethnic groups in the maximum growth age of height. In terms of maximum growth age of weight, Han urban boys (10.33 years old), Japanese urban girls (9.62 years old) and Japanese rural boys (11.44 years old) appeared the earliest in three nationality, and the maximum growth age of weight in the three ethnic rural girls (10.31-10.80) was basically the same.@*Conclusion@#Han and Mongolian students at the age of 7-18 years were obviously superior to Japanese students in terms of growth and development level of height and weight. The maximum growth age of height and weight of urban Han boys was 1.07 and 1.16 years earlier than that of Japanese, while that of rural Han boys was 0.90 and 0.96 years later. And maximum growth age of height and weight of rural Han girls was about 0.49-0.80 year later than that of Japanese.
