Participants and setting

A total of 243 OSHC services were registered on the Australian Children’s Education and Care Quality Authority (ACECQA) website, in 2017, at the time recruitment commenced. OSHC services were eligible to participate in the study if they a) provided care to primary-school aged children (Kindergarten to 6^th grade) b) operated during afterschool hours (15:00 – 18:00 h), c) were located within the Illawarra Shoalhaven or South Western Sydney Local Health Districts in New South Wales, Australia, and d) had more than five students enrolled per day. Once the eligibility criteria were applied, a total of 161 OSHC services were contacted for recruitment. Written informed consent was obtained by each OSHC director. All parents/ guardians had the ability to opt-out (passive consent) their children from the research at any time. The study was advertised to staff, parents and guardians, for a minimum of two weeks prior to the study commencement and throughout the data collection period. Advertisement consisted of several methods; including a) recruitment video and electronic participant information sheets/ opt-out forms were disseminated by each respective OSHC service to all families and employees; b) research notification posters, were displayed at each OSHC entrance, sign in/ out desks and on notice boards; and c) participant information sheets and opt-out forms were available at each sign in/out areas. All children were invited to wear an accelerometer while in attendance at the OSHC, unless parents/ guardians had opted their child out. All children were given the option to refuse their assent on the day of data collection [6, 8]. Ethical approval was granted by the University of Wollongong Human Research Ethics Committee (HE17/490). A brief description of the study procedures are provided below and a detailed protocol has been published elsewhere [8].