“…The results of other studies among adolescents do not give a clear picture. Two research studies which included a somewhat wider age range compared to our research (11-18 and 13-20 years of age) found that the frequency of problematic use increased with the participants' age (López-Fernández et al, 2014;Öz, Arslantaş, Buğrul, Koyuncu, & Ünsal, 2015), while another study determined that the problematic use increased with age in middle school and the first grade of high school, but then decreased in higher grades of high school, which the authors attributed to greater school responsibilities of older students and preparations for final tests (Louragli, Ahami, Khadmaoui, Mammad, & Lamrani, 2018). By comparing participants 3-11 and 12-19 years of age, Csibi, Griffiths, Demetrovics, and Szabo (2019) found that the younger group of participants was more prone to problematic mobile phone use, but also to various conflicts (being reprimanded by adults for overusing mobile phones), mood swings and lower self-control.…”