Table 1 Scores from the quality assessment of each included initiatives

1. Clear description of the objectives of the initiative

2

2

2

2

2

2

2

2

2.0

2. Clear description of the population of interest (e.g., age group, location, gender, ability/need status)

2

2

2

1

2

2

2

2

1.9

3. Clear description of the time of the data collection/compilation (e.g. date, season)

1

1

2

1

2

2

0

1

1.2

4. Clear description of the sampling frame and recruitment methods

1

0

2

2

2

2

0

2

1.4

5. Clear description of the sample’s key characteristics (e.g., size, age, % of male/female)

1

1

2

1

2

2

2

2

1.6

6. Clear description of methods of data collection/ extraction/ compilation for physical activity

2

2

2

2

2

2

2

2

2.0

7. Clear description of the definition of physically active/inactive used

2

2

2

2

2

2

2

2

2.0

8. Adequate measurement of physical activity (validity, reliability)

1

1

1

1

2

2

1

1

1.2

9. Clear description of the data reduction, data analysis and statistical methods employed

2

2

1

1

2

2

2

2

1.7

10. Appropriate interpretation of the statistical findings

1

2

2

2

2

2

2

2

1.9

11. Adequate harmonization and validity of cross-country comparison

1

1

1

1

2

2

1

1

1.2

12. Presentation of specific PA prevalence by country

2

2

2

2

2

2

2

2

2.0

13. Presentation of specific PA prevalence by gender

2

0

2

2

1

2

1

2

1.5

14. Presentation of specific PA prevalence by socioeconomic status

1

1

2

0

0

0

1

0

0.6

15. Presentation of specific PA prevalence by age groups

1

0

2

2

2

2

1

2

1.5

16. Presentation of specific PA prevalence for children and adolescents with disability or chronic condition

0

0

0

0

0

0

0

0

0

17. Representativeness of both urban and rural populations

2

1

1

2

0

1

1

2

1.2

18. Representativeness of children and adolescents not attending school

0

0

0

0

0

1

1

0

0.2

19. Samples are nationally representative samples

2

1

2

2

0

1

2

2

1.5

20. Appropriate description of who analyzed and reported the data

2

1

2

1

2

2

2

2

1.7

Total

28

22

32

27

29

33

27

31

28.6