‘Social screens’ and ‘the mainstream’: longitudinal competitors of non-organized physical activity in the transition from childhood to adolescence

Table 1 Description of non-organized PA and the variables used in initial cluster analysis

Variable	Description
Non-organized physical activity (outcome)^a	Ball games, riding bike/scooter/skateboard for leisure, skipping, running, etc. (the overall term ‘unstructured active play’ was adopted in Wave 5).
Other physical activity^a	Organized PA (organized team sports, organized individual sports)
	Active transport (travel by foot, bike, scooter, skateboard, etc.)
	Active chores/work (e.g. gardening, walking pets, making beds)
Daily living activities	Personal care (bathing, cleaning teeth, getting ready, etc.)
	Health and medical care (doctor, dentist, allied health, etc.)
	Non-active chores (cooking, washing dishes, caring for siblings, etc.)
	Non-active travel (car, bus, train, etc.)
Sleeping/napping	Sleeping^b, napping
Homework/study	Homework, tutoring, private lessons (e.g. music lessons)
School lessons	School lessons
Shopping	Shopping (excluding internet shopping)
Music for leisure	Playing/listening to music for leisure
Reading for leisure	Reading/being read to for leisure
Electronic gaming	Playing electronic games on a computer or console
Television (TV)/movies	Watching TV, DVDs or going to the cinema
Verbal communication	Talking face-to-face, on the phone or via Skype/webcam^c
Texting/emailing/social media	Texting, emailing, instant messaging, spending time on social networking sites^d
Other internet use	General internet browsing, downloading/uploading content, internet shopping, etc.

a.More information about the distinction between domains of PA has been provided in Additional File 2.
b.The duration of sleeping was imputed as the difference between sleep time and wake time within the 24-h period.
c.Skype/webcam use was included in verbal communication, as opposed to internet use because it is a form of synchronous communication and is associated with more affiliative benefits than talking on the phone [20].
d.Texting, emailing and social media use was differentiated from other internet use because it is more socially oriented.

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