I think that this is rubbish (the general and statistically present bit) because 5 is totally unmeasurable and woolly. A statement that broad is meaningless. For anyone to talk about statistics there must have been some sort of determination of families that followed these "rules" and those that didn't, and then some sort of measure of "happiness" where it was shown that the first group were happier than the second.
I think that this is a collection of values that the speaker likes and thinks is associated with "good" children, and that this has been conflated with "happiness". The idea that good=happy is totally iffy in my book as well.
I like Warto's list, but really because it fits with my values as to what I think a good childhood should be about.
As it happens I was brought up with parents who very much endorsed those values (give or take) but although I had manners, and generally knew how to appear respectful, was grateful for a pretty good deal in life, I was also angry and isolated, and I am sure I at times felt very entitled and was also spoilt (I was a teenager after all!). Mainly because the unconditional love was often missing.
I do think this list includes some important things.
Meal times can be a time for the family to be together. But this can be done at other times too (and it does assume a certain style of family life).
Having a part to play in looking after your home/private space is important too (but I don't think having a cleaning lady for example is bad for your personal morals or happiness - in fact it made me very happy indeed).
Not being glued to a screen all day is a good thing (although I prefer some fresh air/exercise as the emphasis) although I don't see books in that sentence, and I think having your nose stuck in a book is just as antisocial (I come from a family of bookworms)
I think the "spiritual dimension" line is bull through and through
The last one is a bit weebly too - "contributes in some way" again too wide - is my family happier because I now go to a PTA meeting every other month or so? Was I happier because my mother did voluntary work ? Was my family happier when I worked for the NHS I wonder?
I think that these are very middle class values/assumptions, fitting nicely with a dad at work, mum at home type lifestyle.