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5. Percentile standards of physical development of Moscow children aged 3-17

Percentile standards of physical development of Moscow children aged 3-17

Fedotova T.K., Gorbacheva A.K.

Lomonosov Moscow State University, Anuchin Research Institute and Museum of Anthropology, Mokhovaya st., 11, Moscow, 125009, Russia

Fedotova Tatiana K, Ph.D., D.Sc., ORCID ID: 0000-0001-7750-7924, e-mail: tatiana.fedotova@mail.ru; Gorbacheva Anna K., Ph.D., ORCID ID: 0000-0001-5201-7128, e-mail: angoria@yandex.ru

Abstract

The data for elaborating percentile standards is based on the anthropological examining of children during 2005-2006 in kinder gardens and schools of three administrative districts of Moscow: Southern, Eastern and Western. The age of the patients is from 3 to 17 years. The total number of samples for body length, chest and waist circumferences equals 1556 for boys and 1500 for girls. The corresponding numbers for weight are 1359 and 1307. The full description of the results of this study is presented in оur book [Fedotova et al., 2007]. The data was devided into age groups with 1 year interval using standard gradations. The sum of percentiles – 5th, 25th,50th,75th and 95th – was determined for each feature and each sex/age groups. As the meanings of percentiles for different age groups are estimated for different children, which results from the cross-sectional character of the study, the dynamics of these indices reveals the additional accidental component. To avoid the major part of this effect and alleviate the influence of accidental variation of statistical values this study appeals to the method of analytic smoothing of the patterns of age dynamics of each percentile using the parabolic equation of the 4th parabola Pi = ao + a1t + a2t2 + a3t3 + a4t4 , where t – age in years, ao, a1, a2, a3, a4 – calculating parameters. Such choice of the form of smoothing equation is explained by the circumstance that parabola 4th parabola usually adequately describes the age changes of patterns of mean values in cross-sectional studies. Smoothed percentile standards are available in three variants, each of them may be used in practice: 1) graphical percentile standards; 2) smoothed values of percentile standards for the age groups of children with half-year intervals presented in the table. Using of them allows more precise diagnostics; 3) equations, which allow the precise calculation of the percentile for any year point, with the detailed explanation of the procedure of calculation.

Keywords

anthropology, physical development, children aged 3-17, height, weight, chest and waist circumference, percentile standards

Цит.: Fedotova T.K., Gorbacheva A.K. Percentile standards of physical development of Moscow children aged 3-17 // Moscow University Anthropology Bulletin (Vestnik Moskovskogo Universiteta. Seria XXIII. Antropologia), 2014; 1/2014; с. 45-56