However, critics would point out that although there was a large number of studies combined for this meta-analysis, the research can be criticised for culture bias as over half (18 out of 32) of the research studies were carried out in the US (individualistic, Western Culture) and only 5 of the studies were carried out in collectivist (non-western) cultures. Therefore, it is difficult to generalise the findings across all cultures when explaining the different types of attachment.