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From the article: "Using data from the March Supplements of the U.S. Census Bureau‘s Current Population Survey and the National Longitudinal Survey of Youth, they look at the cognitive, noncognitive and family traits of self-employed individuals who have incorporated businesses and compare it to the characteristics of salaried workers and the self-employed who don’t have incorporated businesses."

So the population of the study is people who have incorporated businesses. So by "Troubled Teens", it means "Troubled Teens" who did well enough to incorporate a business. But that doesn't count the many troubled teens who ended up poor and/or imprisoned...hopefully parents aren't getting the idea that it's better for their kid to get in trouble if they want to be rich later