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The rural Aymara children on average have longer trunks relative to stature, but there is also overlap in body proportions between the two groups of children. The 20% of each sample in the region of overlap was examined to investigate influences on relative sitting height. Nutritional effects on relative sitting height are suggested by the finding that Aymara children with relatively long legs are taller, heavier, and fatter than other Aymara children. Developmental and genetic influences on relative sitting height are suggested by the finding that high relative sitting heights in elite urban children are associated with a greater percentage of time lived at high altitude and with parents born in Bolivia. Separating developmental and ancestry effects is difficult because the two are closely interconnected in the urban children. The results of this study suggest that influences on growth in relative trunk and leg length are similar to those that affect other aspects of growth in Andean populations. They also highlight the fact that because relative sitting height gradually decreases prior to adolescence and then increases, the interpretation of variation in body proportions in children is not always straightforward. Am. J. Hum. Biol. 2009. \u00a9 2009 Wiley\u2010Liss, Inc.<\/jats:p>","DOI":"10.1002\/ajhb.20918","type":"journal-article","created":{"date-parts":[[2009,3,25]],"date-time":"2009-03-25T19:12:45Z","timestamp":1238008365000},"page":"606-613","source":"Crossref","is-referenced-by-count":18,"title":["Nutritional, developmental, and genetic influences on relative sitting height at high altitude"],"prefix":"10.1002","volume":"21","author":[{"given":"Sara","family":"Stinson","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2009,3,25]]},"reference":[{"key":"e_1_2_1_2_1","first-page":"237","volume-title":"Human growth from conception to maturity","author":"Bailey SM","year":"2001"},{"key":"e_1_2_1_3_1","doi-asserted-by":"publisher","DOI":"10.1002\/ajhb.20667"},{"key":"e_1_2_1_4_1","first-page":"109","article-title":"The effects of high altitude on adolescent growth in southern Peruvian 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