[tppiotrowski]

The fact that it's self reported makes me wonder how close to the actual number it is. Also, how did they choose their sample.

Edit: Link to original paper https://d1wqtxts1xzle7.cloudfront.net/32982174/Turner_-_Appe...

[verteu]

It's the NLSY, about as good a sample as one could hope for.