Määttä, Suvi; Nuutinen, Teija; Ray, Carola; Eriksson, Johan G.; Weiderpass, Elisabete; Roos, Eva (Journal article; Tidsskriftartikkel; Peer reviewed, 2016-02-08)
Background: The aim of this study is to assess the repeatability and validity of the Finnish 11-year old children’s
out-of-school physical activity (PA) questionnaire using accelerometer as reference method. A sub-sample of
children (N = 155, 60 % participant rate) participating in the Finnish Health in Teens study was recruited in 2013.
Children completed a questionnaire measuring PA two times, ...