Ecological Momentary Assessment

EMA is described as reducing recall bias and enabling daily-life data collection. Stress and fatigue prompts are sent six times per day between 09.00 and 21.00 with at least one hour between prompts. Experience Sampling Method prompts occur four times per day with reminder prompts at 30 and 60 minutes. Momentary fatigue and stress are measured with smartphone-based ecological momentary assessment during the same seven-day periods as accelerometry. Fatigue is measured with three questions about tiredness, fitness and physical exhaustion. Momentary stress is assessed with three adapted questions, including two from the PSS-10 and one emotion item. EMA content includes context, sleep, affect, aggression, violent ideations, anger rumination, self-control, tonic and phasic irritability, and conflicts. Passive smartphone sensing records screen state, Bluetooth activity, and app usage on Android, while iPhone users provide Screen Time screenshots. Parents can report temper tantrums through an event-triggered questionnaire sent each morning and repeat it multiple times per day.