My advice is not to pay any mind to those studies. You can even look at NT/NT marriages, and with the huge divorce rate they don't look too pretty either. The point I'm trying to make is that each situation is unique, and each partner is their own person. There is no generic "NT" or AS" template, although we may share some common features. What matters is that you find the right person for you, and do your part to work on the relationship. If you work to be the best person that you can be, then that's all you can do!