Secondary outcomes: body mass index, PA family health climate and quality of the father-child relationship
Fathers’ Body Mass Index (BMI, in kg/m²) was calculated based on self-reported height and weight through the online questionnaire. BMI z-scores (i.e. a sex- and age adjusted measure of BMI) of children were also calculated based on their weight and height, which were proxy-reported by the father in the questionnaire. The family context on PA (i.e. shared perception and cognitions regarding daily activity behaviours among the family and family members) was surveyed using the validated FHC-PA (i.e. the Family Health Climate Scale for Physical Activity) [