Abstract:
Objective To construct percentile curves for height and weight of child and adolescent students using coefficient of skewness-median-coefficient of variation – Lambda-Mu-Sigma (LMS) method and to analyze rural urban difference in growth and development of the students for the application of LMS method in relevant researches.
Methods Using cluster random sampling, we selected 25 475 students aged 7 – 18 years in 110 primary and high schools in urban and rural regions across Sichuan province in 2018. Based on the data of height and weight measurement, the 5th, 50th and 95th percentile (P5, P50 and P95) curves for the urban and rural students were constructed using LMS method with the software (LMS chartmaker Light Version 2.54) and the differences between the urban and rural students with the height and weight of P5, P50 and P95 values were analyzed.
Results The urban and rural differences in average height for the boy students with the P5, P50 and P95 value were 0.03, 1.20 and 1.60 cm, and those for the girl students were – 0.32, 0.88 and 0.95 cm; while, the urban and rural differences in average weight for the boy students with the P5, P50 and P95 value were 0.18, 0.96 and 1.85 kg, and those for the girl students were – 0.25, 0.29 and 1.55 kg, respectively.
Conclusion For the child and adolescent students in Sichuan province, the urban and rural difference in average height and weight are larger in the boy students than in the girl students and both the differences are larger in the students with higher percentile values than in the students with lower percentile values. For the students with 50th and 95th percentile value of height and weight, the urban and rural differences increase first and then decrease with the increment of the sutdents′ age.
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