Duration of Active Attenuated Psychosis (DAAP): Extending time-based illness modelling to the clinical high-risk state

We propose the Duration of Active Attenuated Psychosis (DAAP) as an analogue of DAP for CHR-P populations. DAAP is defined as the cumulative period since the onset of attenuated psychotic symptoms during which an individual experiences either (a) positive symptoms within the attenuated/subthreshold range, as operationalized by validated CHR-P instruments (e.g., CAARMS, SOPS), or (b) transient full-threshold psychotic symptoms, whether treated or untreated. This expanded formulation reflects the phenomenological continuity between attenuated and full psychosis and recognizes the prognostic and functional significance of subthreshold experiences.