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 activitya | 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 | Sleepingb, 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/webcamc |
| Texting/emailing/social media | Texting, emailing, instant messaging, spending time on social networking sitesd |
| 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.