OBJECTIVE: To examine the long term IQ trajectory for childhood-onset schizophrenia (COS) in an expanded, prospective longitudinal study. METHODS: Seventy children meeting DSM criteria for schizophrenia were tested at 2 year intervals with age appropriate Wechsler intelligence tests and repeated administration of information and comprehension WISC subtests even after age 18. For a subgroup with 31 patients, pre-NIH IQ test administrations were available including 18 pre-psychotic and 13 post-psychotic subjects. The pattern of IQ performance over time was determined using mixed model regression analysis. RESULTS: No progressive cognitive decline was seen up to 13+ years post psychosis onset. For the subgroup of subjects with pre-illness scores, there had been an initial steep decline in IQ, from about 2 years prior to 1.7 years after onset of psychotic symptoms, as reported for adult patients. CONCLUSIONS: The level long-term trajectory of IQ measures in COS appears stable, similar to that reported for adult onset patients. For COS, level cognitive functioning extends up to 13+ years post psychosis onset, in spite of chronic illness and concomitant, progressive loss of cortical gray matter.
OBJECTIVE: To examine the long term IQ trajectory for childhood-onset schizophrenia (COS) in an expanded, prospective longitudinal study. METHODS: Seventy children meeting DSM criteria for schizophrenia were tested at 2 year intervals with age appropriate Wechsler intelligence tests and repeated administration of information and comprehension WISC subtests even after age 18. For a subgroup with 31 patients, pre-NIH IQ test administrations were available including 18 pre-psychotic and 13 post-psychotic subjects. The pattern of IQ performance over time was determined using mixed model regression analysis. RESULTS: No progressive cognitive decline was seen up to 13+ years post psychosis onset. For the subgroup of subjects with pre-illness scores, there had been an initial steep decline in IQ, from about 2 years prior to 1.7 years after onset of psychotic symptoms, as reported for adult patients. CONCLUSIONS: The level long-term trajectory of IQ measures in COS appears stable, similar to that reported for adult onset patients. For COS, level cognitive functioning extends up to 13+ years post psychosis onset, in spite of chronic illness and concomitant, progressive loss of cortical gray matter.
Authors: Jens Richardt M Jepsen; Birgitte Fagerlund; Anne Katrine Pagsberg; Anne Marie R Christensen; Merete Nordentoft; Erik L Mortensen Journal: Eur Child Adolesc Psychiatry Date: 2010-08-01 Impact factor: 4.785
Authors: Jeffrey R Wozniak; Erin E Block; Tonya White; Jonathan B Jensen; S Charles Schulz Journal: Early Interv Psychiatry Date: 2008-08 Impact factor: 2.732
Authors: Jens Richardt Moellegaard Jepsen; Birgitte Fagerlund; Anne Katrine Pagsberg; Anne Marie R Christensen; Rikke W Hilker; Merete Nordentoft; Erik L Mortensen Journal: Eur Child Adolesc Psychiatry Date: 2009-09-10 Impact factor: 4.785