Yeah I expected 10x the rate, but sadly those are the "successful" pregnancies.

Also it only would be able to capture cases where reproduction is actually possible --in some cases it obviously is not possible.

Another data source would be STD transmission.

the article gives reasons why its still probably an underestimate.

the article has a quote “That’s way, way more than I think many people would ever imagine,” but I don't have much intuition with 1/7000. The LLM tells me 1/7000 is the 6'7.5" quantile for US adult males. That doesn't sound too far off from what I would have expected of this type of incest, if I had to hazard a height quantile before reading this article. Maybe I would've gone for 6'9". If it was like 6'4", I would be seriously nauseated. I've never had a friend over 6'5" but a number < that. Which would suggest.

Wouldn't that 1/7000 number just be from successful pregnancies?