Massimiliano Tani, Maurizio Manuguerra, Samia Khan
Can videos affect learning outcomes? Evidence from an actual learning environment
Educational technology research and development : ETR & D
study height sitting height lower extremity length growth status body proportions elementary school students aged 6 12 years tianyuan district zhuzhou city china analyzed total 41156 children 38 elementary schools tianyuan district zhuzhou city selected height measurement employing cluster sampling method cluster data obtained height sitting height information extracted calculations performed lower extremity length sitting heighttolower extremity length ratio sitting heighttoheight ratio statistical analysis conducted using spss 230 software height sitting height measurements boys girls aged 6 12 years tianyuan district surpassed 2005 national standard set 9 cities lower extremities children within 7 9 age range fell national standard alignment national average fitted curve representing height boys girls aged 6 12 years tianyuan district exhibited intersection point around 10 105 years discernible distinction observed incidence short stature analyzed p3 standard fitted curve tianyuan district national standard moreover tall children exhibited significantly lower sitting heighttoheight ratio compared shorter counterparts fitted height curve tianyuan district zhuzhou city proves effective discerning shorterstatured children within region nevertheless research warranted elucidate factors contributing comparatively shorter lower extremities observed children tianyuan district zhuzhou city contrast national average