I wonder whether the following result stems from that sample bias (Mensa membership, rather than random sample from >= 98th percentile IQ): > Their most striki

I wonder whether the following result stems from that sample bias (Mensa membership, rather than random sample from >= 98th percentile IQ): > Their most striking finding was substantially diminished levels of meaningfulness and subjective well-being among the giftedness as potential group compared to both the giftedness as achievement group and the control group EDIT to add: Note that the author addresses the sampling bias in a footnote: > Of course, a major limitation of this study is the preselection of the gifted populations. It's likely that members of MENSA have their own unique struggles that motivate them to seek out membership and connect with like-minded individuals. While this is a real limitation of the study, at least it's a real attempt to look at the understudied population of intellectually gifted adults, a population that is hard to study because they are statistically rare in the general population. After all, for a non-preselected sample, you would have to administer IQ tests to 5,000 people to attain a modest sample of 100 people in the top 98th percentile!