| Summary: | In modern society many adolescents participate in some extracurricular activities after school so it´s important to research if they have positive or negative effects in the adolescent´s life. The aim of this study was to research the effects that sports and other organized activities have on school grades and drug use among adolescents. Participants in this study where around 4000 students in 9th and 10th grade in Iceland, around 2000 each year that was researched. Students answered questions that discussed sports, organized activities, school grades and drug use. Two hypotheses were presented: (1) Sports and other organized activities affect school grades among aldolescents. (2) Sports and other organized activities affect drug use among adolescents. Because there are data from two differents years we can see if there is some difference between the years. There was significant effects on school grades for adolecsents that participates in sports and organized activities both in 2006 and 2009. There was also significant effects on drug use for adolcents who participated in sports both 2006 and 2009 but there where only significant effects on drug use for adolcents that participated in organized activities in 2006 but not in 2009. Í nútíma samfélagi stunda margir unglingar íþróttir eða aðrar skipulagðar tómstundir eftir skóla svo mikilvægt er að rannsaka hvort það hafi jákvæð eða neikvæð áhrif á líf unglinganna. Markmið þessarar rannsóknar var að kanna hvort íþróttir eða aðrar skipulagðar tómstundir hefðu áhrif á einkunnir í skóla og fíkniefnaneyslu unglinga. Þátttakendur í þessari rannsókn voru um það bil 4000 nemendur í 9. og 10. bekk á Íslandi, um 2000 nemendur bæði árin sem voru rannsökuð. Nemendur svöruðu spurningum sem fjölluðu um íþróttir, skipulagðar tómstundir, einkunnir í skóla og fíkniefnaneyslu. Tvær tilgátur voru settar fram: (1) Íþróttir og aðrar skipulagðar tómstundir hafa áhrif á einkunnir í skóla meðal unglinga. (2) Íþróttir og aðrar skipulagðar tómstundir hafa áhrif á fíkniefnaneyslu meðal ...
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