A new method for analysing transition to psychosis: Joint modelling of time-to-event outcome with time-dependent predictors

Int J Methods Psychiatr Res. 2018 Mar;27(1):e1588. doi: 10.1002/mpr.1588. Epub 2017 Sep 24.

Abstract

An active area in psychosis research is the identification of predictors of transition to a psychotic state among those who are assessed as being at high risk of psychosis. Many of the potential predictors are time dependent in the sense that they may change over time and are measured at a number of assessment time points. Examples are various psychopathological measures such as negative symptoms, positive symptoms, depression, and anxiety. Most research in transition to psychosis has not made use of the dynamic nature of these measures, probably because suitable statistical methods and software have not been easily available. However, a relatively new statistical methodology is well suited to include such time-dependent predictors in transition to psychosis analysis. This methodology is called joint modelling and has recently been incorporated in mainstream statistical software. This paper describes this methodology and demonstrates its usefulness using data from one of the pioneering studies on transition to psychosis.

Keywords: joint modelling; time-to-event outcome; transition to psychosis.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Adult
  • Data Interpretation, Statistical*
  • Follow-Up Studies
  • Humans
  • Models, Statistical*
  • Prodromal Symptoms*
  • Psychotic Disorders / diagnosis*
  • Psychotic Disorders / physiopathology
  • Risk
  • Time Factors