Intervention

The parents were recruited to the study by trained volunteers at the local vaccination clinic, providing vaccinations, around the Zaatari camp. The app offered the following functions: (a) Allowed storing Jordanian vaccination records, per child, on the parents’ smartphones in Arabic and in English languages (in an interchangeable fashion); (b) Every vaccination record had a set of automated reminders prior the appointment of each child. The appointment reminder was displayed on the users’ phones at four different time points before the vaccination schedule (one week, three days, and one day and the morning of the appointment). Thereafter, the users received two notifications in the coming days of the scheduled vaccine in case of missing the appointment (at one and two weeks time); and (c) Summarized the immunization records in form of “due”, “taken” or “overdue” appointments, labeled in orange, green and red respectively. The inclusion criteria of the study were (i) having at least one child age 0–5 years of age; (ii) being a local resident of the camp and (iii) having an Android smartphone that can allow CIMA app installation.