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@rockhopper72 Just regarding the point about whether daycare is high quality, it is helpful to differentiate. In the UK we have a inspectorate body who assess daycares, so if you can say "30 hours at an outstanding daycare is just as good as a stay at home parent in terms of emotional...

@rockhopper72 Ok, from the BEIP study I gather that children who were raised with inadequate love and affection were shown have serious problems later in life. But that was obvious to people 80 years ago. That's why Oliver Twist lived in a workhouse, and not with a loving adopted family...

@rockhopper72 Thanks for your response. I agree RCTs are not always good quality, and not always possible. Natural experiments involving twins are pretty close, but there aren't enough of them. However, in the natural sciences you set out to test just one variable, and you should still aim to...

@rockhopper72 Isn't the whole point of a Cochrane meta-analysis to gather that mass of evidence? So taking all the small but good quality studies together and seeing whether they're all pointing one way? Doing more and more of the same fundamentally flawed studies doesn't actually make the...