In 2016, a study by the NCD Risk Factor Collaboration indicated 124 million children and adolescents worldwide were obese, compared with 11 million in 1975. According to the study, 73% of this change resulted from an increased prevalence of obesity (as opposed to other factors, such as population growth). The study also reported that between 1975 and 2016, the number of obese adults worldwide rose from 100 million to 671 million. Figures for children/adolescents and adults who were overweight, but not obese, were 213 million and 1.3 billion, respectively, in 2016.