Rutter et al. The English and Romanian (ERA) Adoptee Study - Statistics

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By age 11, the children were showing differing rates of recovery depending on their age of adoption. What was the mean IQ for those adopted before 2 months old? 102
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11
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15
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How many Romanian orphans that were adopted in Britain did the study follow? 165
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Physical, cognitive and emotional development was tested at what ages? 4
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Approximately what percentage of the Romanian adoptees had abnormally low intelligence when they were first adopted? 50%
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There was a control group of how many British children, adopted around the same time 52
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6
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And for those adopted after the age of 2? 77
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For those adopted between 6 months and 2 years old? 86
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Children adopted after the age of 6 months often showed what form of attachment, which is related to being equally friendly to people they know well and total strangers? disinhibited
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