Physical Activity
Early adulthood physical activity and sport participation was assessed with a question: What kind of regular physical activity have you done at different stages of your life?18 Based on the answers, participants were divided into three groups: no exercise at the age 17–19 and/or 20–29, regular physical activity at the age 17–19 and 20–29, and competitive sport at the age 17–19 and/or 20–29. Current physical activity was evaluated with a structured questionnaire including four questions about the frequency, intensity, and duration of leisure-time physical activity bouts and the average time spent in active commuting.19 Based on the answers, a metabolic equivalent of a task hours per day (MET-h/d) was calculated to express the intensity and volume of current physical activity.