Functioning pre- and post-treatment in schizophrenia: further investigations into lead time bias and duration of untreated psychosis
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Functioning pre- and post-treatment in schizophrenia : further investigations into lead time bias and duration of untreated psychosis. / Albert, Nikolai; Hansen, Helene Gjervig; Starzer, Marie; Nordentoft, Merete; Hjorthøj, Carsten.
In: Schizophrenia Research, Vol. 252, 2023, p. 287-293.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Functioning pre- and post-treatment in schizophrenia
T2 - further investigations into lead time bias and duration of untreated psychosis
AU - Albert, Nikolai
AU - Hansen, Helene Gjervig
AU - Starzer, Marie
AU - Nordentoft, Merete
AU - Hjorthøj, Carsten
N1 - Publisher Copyright: © 2023 Elsevier B.V.
PY - 2023
Y1 - 2023
N2 - Objective: The association between duration of untreated psychosis (DUP) and later outcome is not fully understood. Jonas et al. in their 20-year follow-up found that the association could be explained by lead-time bias. In this study we aimed to analyze the relationship between DUP, time since onset of psychosis and functional outcome using a similar statistical approach as the Jonas study. Method: Using data from 496 participants with first-episode schizophrenia, DUP was assessed using the IRAOS and functioning at the baseline assessment and the subsequent follow-ups (1, 2, 5 and 10 years) was assessed using the GAF-F. For premorbid functioning, the Premorbid Assessment of Functioning Scale was used and rescaled to correspond to the GAF. Results: The model with the best fit of data included both a slope and a level change. This model of level of function over time had the inflection point at the time of first treatment. This model indicated a slow decline per year until first treatment, at which point there was a sharp decrease in functioning, and after which functioning gradually improved again. Both in this model and in models accounting for potential lead-time bias, however, longer DUP was associated with a decrease in function for each additional week of DUP. This is in contrast with the Jonas et al. study. Conclusion: In this study, we did not find evidence of a lead-time bias, but rather found that onset of treatment occurs at the time when participants level of functioning was most impaired, and consequently was not at random.
AB - Objective: The association between duration of untreated psychosis (DUP) and later outcome is not fully understood. Jonas et al. in their 20-year follow-up found that the association could be explained by lead-time bias. In this study we aimed to analyze the relationship between DUP, time since onset of psychosis and functional outcome using a similar statistical approach as the Jonas study. Method: Using data from 496 participants with first-episode schizophrenia, DUP was assessed using the IRAOS and functioning at the baseline assessment and the subsequent follow-ups (1, 2, 5 and 10 years) was assessed using the GAF-F. For premorbid functioning, the Premorbid Assessment of Functioning Scale was used and rescaled to correspond to the GAF. Results: The model with the best fit of data included both a slope and a level change. This model of level of function over time had the inflection point at the time of first treatment. This model indicated a slow decline per year until first treatment, at which point there was a sharp decrease in functioning, and after which functioning gradually improved again. Both in this model and in models accounting for potential lead-time bias, however, longer DUP was associated with a decrease in function for each additional week of DUP. This is in contrast with the Jonas et al. study. Conclusion: In this study, we did not find evidence of a lead-time bias, but rather found that onset of treatment occurs at the time when participants level of functioning was most impaired, and consequently was not at random.
KW - Duration of untreated psychosis
KW - Lead time bias
KW - Outcome
KW - Psychosis
KW - Schizophrenia
U2 - 10.1016/j.schres.2023.01.003
DO - 10.1016/j.schres.2023.01.003
M3 - Journal article
C2 - 36706472
AN - SCOPUS:85146872468
VL - 252
SP - 287
EP - 293
JO - Schizophrenia Research
JF - Schizophrenia Research
SN - 0920-9964
ER -
ID: 370662345