Boundary Comparison Lab · F90-F98

Compare any two F90-F98 categories

Pick two categories and see what actually discriminates them: overlap, decisive evidence, duration/course, exclusions, and the common trap. This is a separate learning mode from the Differential Decision Lab — here you are studying a boundary directly, not making a single timed decision.

Or browse all authored comparisons

• F90 vs F84

  Distinguish attention/activity regulation difficulty (F90) from a pervasive developmental disorder (F84), using the presence or absence of the qualitative social-interaction/communication/restricted-behaviour triad — a cross-block boundary check, since inattention and overactivity frequently co-occur with F84 and can be coded alongside it when both are genuinely present.

• F90 vs F91

  Distinguish attention/activity regulation difficulty (F90) from a persistent pattern of rule-violating, aggressive, or defiant conduct (F91), using which feature is primary — while recognising the two frequently co-occur and are captured together by F90.1 when both are genuinely present.

• F91 vs F93

  Distinguish externalizing, rule-violating conduct (F91) from internalizing emotional distress (F93), using which feature is primary, since a young person's distress can present outwardly as defiance or acting-out rather than as visible sadness or worry.

• F92 vs F91

  Distinguish a genuine mixed disorder of conduct and emotions (F92), requiring both a conduct-disorder-level pattern and an independently diagnosable emotional disturbance, from a conduct disorder alone (F91) with only brief, situational irritability that does not meet its own emotional-disturbance threshold.

• F93 vs F94

  Distinguish a fear/worry-based emotional reaction (F93) from a social-functioning pattern rooted in the caregiving environment itself (F94), since both can present as a child showing wariness, distress, or unusual social behaviour around others.

• F95 vs F98

  Distinguish a tic (F95) from a stereotyped movement (F98.4), using the character of the movement — sudden, rapid, non-rhythmic, and involuntary versus rhythmic, sustained, and voluntary-seeming — rather than the movement's severity or social visibility.

Only comparisons involving a currently available category appear here. As more categories are authored, more comparison pairs will appear.