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Extant literature has generally conceptualized nonsuicidal self-injury severity in terms of its frequency, although more recently researchers have assessed nonsuicidal self-injury severity by the number of different methods used. There is limited evidence, however, regarding the interaction of these indices in the prediction of clinical severity. The current study aimed to examine these relationships among 2,707 undergraduate students (70% female, M age= 20.60, 29.95% with nonsuicidal self-injury history) who completed online self-report questionnaires. Analyses utilized structural equation modeling trees and structural equation modeling forests to identify potential subgroups based on nonsuicidal self-injury frequency and/or methods in relation to indicators of clinical severity. Results revealed splits in the following:(a) frequency (between 0 and 1 act);(b) among those with≥ 1 acts …