Combined (standard score normalization over original data sets), fully anonymised data for article manuscript. Includes 3 original data sets: Data set 1: 2486 respondents, aged 15-19, from both the basic and secondary education and students from the preparatory training groups, collected in 2014 - 2016. Data set 2: 9,316 basic education level students, ages 15-17, collected in 2017-2019. Data set 3: 3,090 secondary education students, ages 15-19, collected in 2017. Includes a total of 14,892 young Finns, aged 15-19. Contains information on adolescents' activity in six usage categories (maintaining social relationships, using digital services, following current affairs, online communicating, digital gaming, and searching for information on a scale of 0 = never, 1 = occasionally, 2 = weekly, 3 = daily, 4 = several hours daily) and an indicator of their digital skills. For usage categories both initial and z-score values, for digital skills only z-score values. Background variables: Age, Gender (0 = female, 1 = male, missing value = don't want to share the information), LevelOfEducation (1 = basic education, 2 = secondary education), FormOfEducation (0 = comprehensive school, 1 = preparatory training for vocational education, 2 = vocational upper secondary school, 3 = general upper secondary school), and RerularityOfEducation (0 = regular transition, 1 = delayed transition).