The prevalence of SA and NSSI in the full sample most closely approximated estimates from individuals (in concordant and discordant twin pairs) who did not endorse EAU (Table 2; columns 2 and 3). Chi-square tests revealed no significant differences between the prevalence rates of SA and NSSI by EAU status, nor were their differences in self-harm between twins in concordant and discordant pairs who endorsed EAU (columns 4 and 5). However, within the discordant pairs, EAU was associated with significantly higher rates of both SA, χ2 (1, N=1396)=6.93, p<.01, and NSSI, χ2 (1, N=1396)=14.40, p<.01, relative to prevalence rates of self-harm for the non-EAU co-twins (columns 3 and 4).
