AnnieLobeseder- they did include dads working (although not sure if this was reported by the mums who are the main ones answering the questions). The research confirmed that those who have the worst social and behavioural outcomes in the early years are those with single mums and in households where no-one is working, which is pretty consistent with other studies, and likely to be due to obvious stuff like poverty and higher levels of PND.
Working9while5, your grandma's sad experience pretty much sums up why it is better for most women to work, in terms of having financial independence, less likely to be depressed, trapped in abusive situations etc.
I don't find it surprising that people ignore well-designed studies for several reasons. These studies tell us about general patterns but not how things might play out in our own individual lives. It may be true that in general SAHM are more likely to get depressed, for example, but doesn't mean we will if we stay home. Similarly, if you go out to work, you may personally not get the benefits in terms of lots of money, using your education, if you have a nervous breakdown or are constantly stressed. ome children who go to nursery may be more aggressive (if you believe that research) but if yours isn't personally, why is this a concern for you in your life decisions. I read some research which said grandparent care wasn't as good overall as nursery- how does this affect me personally when my mum is a wonderful carer for my child? I'd be crazy to take my children away from my mum and send them to nursery on this basis!
Also, each study is quite limited as of itself, this one has no non-white people in, for example, so tells us pretty much nothing about the effect of working patterns on non-white children, a pretty big group to exclude (why were they excluded, by the way? Is there not enough data, was it a deliberate exclusion on some basis?)
I personally don't work because I have to (I do) or because I have read studies that say it is fine, I work because I believe I have something to contribute, and find it personally satisfying.