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In this nationwide study, 1975 students from grades 3, 6, and 9 (ages 9, 12, and 15 at the onset of the year), were recruited from randomly selected schools, which represented different geographical areas throughout Sweden.The main aim of the study was to assess the prevalence of self-reported pain (headache, abdominal, and musculoskeletal pain) and perceived health (problems sleeping and/or if they...