10.60933/PRDR/PVQJ68LO, Kin Ming CamillaKin Ming CamillaLO0000-0002-4381-9361PolyU Research Data Repository2025Social SciencesScreen timeChildren's healthLO, Kin Ming CamillaKin Ming CamillaLOThe Hong Kong Polytechnic University2025-06-052025-06-0510.1016/j.chb.2024.10828410.1016/j.chbr.2025.100720735879717243text/tab-separated-valuestype/x-r-syntax1.0CC BY-NC 4.0The data set contains screen time and health measurements of a representative sample of primary school children (N = 1428) in Hong Kong across two measurement time points over a period of one year from June 2021 (T1) to August 2022 (T5). Parents of the children completed the questionnaires. The data set also contains a sub-sample of 337 parents who were randomly selected from the larger sample. They completed additional questionnaires at 3-month intervals (T2, T3, and T4).