Ijzendoorn & Kroonenberg compare rates of attachment type in 8 countries and found more variation within than between countries
Simonella et al found Italian secure attachment rates dropped 50%, thought to be due to increased daycare
Jin et al found Korean insecure-avoidant rates similar to Japan (very low), could be due to similar child-rearing styles
Concluded attachment is innate, secure attachment is the norm, but culture impacts attachment types
