“…At each observation unit, the observers coded activity types and counted the number of children participating in each type of activity. We classified playground social behaviors based on the Howes Peer Play Scale ( Howes & Matheson, 1992 ) as used by Mahony, Hyndman, Nutton, Smith, and Te Ava (2017) and adjusted to our research aims. The following categories were included: solitary no play (e.g., observing, eating or moving without interactions with other children), solitary play (playing alone or in parallel to others without interacting with them), social no play (e.g., talking), social play (e.g., any playful joint activity, from imaginary play or joint drawing to rough and tumble or soccer), conflict (arguing, fighting or any negative interaction between children equal in power), and bullying (physical or verbal bullying, or other forms of social rejection when children were not equal in power).…”