Anxious/insecure-avoidant attachments are more common among German infants due to different child-rearing styles e.g. mothers encourage independence
Anxious/insecure-resistant attachments are more common in collectivist cultures like Japan (Van Ijzendoorn and Kroonenberg, 1988)
Van Ijzendoorn and Kroonenberg (1988) conducted a meta-analysis study across a range of countries to assess cultural variation by looking at proportions of secure, insecure-avoidant and insecure-resistant attachments.
They also looked at the differences within the same countries to get an idea of variations within a culture.
The meta-analysis summarised findings from 8 countries:
the UK, the US, Israel
Sweden, Holland, Germany
China, Japan
they found that the most common attachment type was type B (secure) at 67%
type A (insecure-avoidant) was 21%
type C (insecure-resistant) was 12%
All countries except Germany found their most common attachment type to be secure attachment
In general, type A attachment was found in more western countries, whilst type C was more common in Israel, China and Japan