Study population
The initial sample consisted of 1456 children and adolescents. 386 participants were excluded because of missing information on their means of transport (Fifty-three percent of the participants were boys. Most participants had a mid-level socioeconomic status (SES) (58%); low SES (2%) was under- and high SES overrepresented (34%). Information on SES was missing in 6% of cases. A more detailed description of participants’ socioeconomic status is provided in Additional Table Questions regarding perceived barriers with answer options (multiple choice)
For 298 out of 364 children, information regarding all barriers as well as sociodemographic variables were available. The multivariate analyses were carried out on this complete subsample. The adolescent subsamples comprised 527 (out of 706, parent-reported information on barriers) and 570 (self-reported information on barriers) participants. Compared to participants without missing information, the excluded individuals had a significantly higher number of perceived barriers (b = 1.01, 