Infant attachment can remain stable into adulthood for certain demographics and individuals. One such study examined attachment security in childhood and early adulthood and found that 72% of participants received the same rating of secure as insecure attachment (Waters et al., 2000). In the study, 60 twelve-month-old white middle-class infants were tested using the Strange Situation (Waters et al., 2000). In the study, 58% of children were classified as secure, 24% insecure-avoidant, and 18% insecure-resistant (Waters et al., 2000). The Strange Situation was also performed at 18 months on most participants (Waters et al., 2000). 20 years later, 50 of the original participants (21 male, 29 female) underwent the Berkley Adult Attackment Interview (Waters et al., 2000). The Adult Attachment Interview suggested that 50% of participants were secure, 32% were insecure and disinterested, and 18% were insecure paranoid (Waters et al., 2000). The vast majority of participants received the same attachment style, and the study suggested that the change was due to negative life events. Although the study suggests that change in attachment style is attributed to negative life events, 22% of mothers who reported no negative life events had children who changed classifications, and eight participants indicated they had experienced significant events in their lifetime. their life.