Teun Remmers

Appendix 1 | 227 Appendix 1: Supplemental Material Chapter 4 Table S1: Items assessing family and physical environment with regard to child outside play engagement Construct Construct properties Construct description Translated item Response scale Dichotomous scale Family environment Parental attitude Cronbach’s alpha 0.86 Parental attitude to improve child engagement in outside play I think it is important for my child to improve child engagement in outside play 1=totally disagree to 5= totally agree - Scale range 1-5 I think it is good for my child to improve child engagement in outside play 1=totally disagree to 5=totally agree - I think it is healthy for my child to improve child engagement in outside play 1=totally disagree to 5=totally agree - Family attitude Cronbach’s alpha 0.85 Family attitude to improve child engagement in outside play I think my child should increase engagement in outside play 1=totally disagree to 5=totally agree - Scale range 1-5 My partner thinks our child should increase engagement in outside play 1=totally disagree to 5=totally agree - My family thinks my child should increase engagement in outside play 1=totally disagree to 5=totally agree - Perceived difficulty - Parental perception of their difficulties in improving child engagement in outside play It is difficult to let my child engage in more outside play 1=totally agree to 5=totally disagree 1=agree (strongly agree, agree), 0=not agree (not agree/not disagree, disagree, strongly disagree) Self confidence - Parental confidence in their own ability to improve child engagement in outside play I can let the child engage in more outside play 1=totally agree to 5=totally disagree 1=agree (strongly agree, agree), 0=not agree (not agree/not disagree, disagree, strongly disagree)