# Table 4 Analysis of initial PLKQ question difficulty among 637 respondents

Question Average score or % correct response Measure Difficultya
1. Physical activity importance 8.65 ± 1.6 (out of 10) −1.56 S.E. = 0.08 Easy
2. Importance to be more active than you are now 5.01 ± 2.7 (out of 10) 0.64 S.E = 0.05 Moderate
5. Compared to other kids how active are you? 6.91 ± 2.1 (out of 10) − 0.76 S.E. = 0.06 Easy
6. Compared to other kids your age how good are you at sports or skills? 6.58 ± 2.39 (out of 10) − 0.3 S.E. = 0.06 Moderate
7. Cardiorespiratory means? 48% (300/626)** 0.44 S.E. = 0.08 Moderate
8. MVPA at school 11.9% (79/665) 2.44 S.E. = 0.12 Hard
9. MVPA for the whole day? 70% (441/632)** − 0.42 S.E. = 0.08 Moderate
10. Minutes of sedentary time per day? 19% (122/635) 1.78 S.E. = 0.09 Hard
11. Healthy means? (total score = 11) 4.91 ± 1.8 (out of 11) 0.22 S.E. = 0.09 Moderate
12. Identify sport skill 68.8% (451/656) −0.47 S.E. = 0.08 Moderate
13. Fill in the spaces in the story 5.96 ± 2.0** (out of 9) −0.67 S.E. = 0.11 Moderate
14. Sunscreen in the summer 62% (376/606) −0.07 S.E. = 0.08 Moderate
15. Sunscreen in the winter 3.4% (19/606) 3.75 S.E. = 0.22 Hard
16. Identify healthy foods 2.81 ± 0.49 (out of 3) − 1.33 S.E. = 0.08 Easy
17. Wearing safety equipment 2.77 ± 3.5*, ** (out of 11)
21. Skill acquisition 30% (189/436) 1.09 S.E. = 0.08 Hard
22. How to get in better shape 88% (551/632) −1.52 S.E. = 0.11 Easy
25. Preferred activities after school 68% (413/608)
26. Sedentary time spent on computer 6.61 ± 2.5 (out of 15) − 0.13 S.E. = 0.04 Moderate
27. Sedentary time spent watching TV 7.81 ± 2.4 (out of 15) 0.15 S.E. = 0.04 Moderate
1. *gender difference
2. **age difference
3. aDifficulty of each measure was assessed by using the following criteria: < − 0.7 = easy; − 0.7 to 0.7 = moderate; > 0.7 = hard
4. MVPA moderate to vigorous physical activity, S.E. standard error