Change in physical activity level from T1 to T2. Percentage of participants who were physically active 0–2 hours per week or 3 or more hours per week at baseline (T1) and follow-up (T2), and percentage who maintained or changed activity level from T1 to T2 in ethic Norwegian (a and c) and ethnic minority (b and d) boys and girls.
* indicates the number of participants who answered the question about physical activity at both times.
Sagatun et al. BMC Public Health 2008 8:419 doi:10.1186/1471-2458-8-419