Psychological studies do not support this view or, at best, offered mixed results. Results from earlier studies are inconsistent with some more recent studies that suggest there are no reliable differences between only children and those with siblings. However, a survey published in 2013 on 431 Beijing adults finds that those who had grown up after the introduction of the one-child policy were lacking "entrepreneurial drive and the willingness to take risks". This even had a significant impact on career choices.