How many studies did Van ijzendoorn use?

How many countries did he use?

What was the most common Attachment type he found?

What was the range of secure attachment found?

What was the least found attachment type?

What was the range of insecure-resistant attachment types?

Who found the highest amount of insecure-avoidant?

What is a stength of Ijzendoorn's study?

What is a limitaiton of Ijzendoorn's study?

What is another limitation of ijzendoorn's study?