A study on marital instability finds that one out of ten children from divorced families reach adulthood with a lower level of psychological well-being than they would have had if their parents remained married.
Source:
"Reconciling Divergent Perspectives: Judith Wallerstein, Quantitative Family Research"
Amato, Paul R
Family Relations Vol. 52, Number 4. , 2003. Page(s) 332-339.
(HT: FamilyFacts.org)

Just browsing the internet, your blog is very, very interesting.
A stury in human psychology has determined that when confronted with situations of unhappiness, 8 out of 10 people are assaulted with feelings of being unhappy.
That is surprisingly low. So 9 out of 10 had no adverse permanent psychological effects?