Estimating effects of proband characteristics on familial risk: II. The association between age at onset and familial risk in the Maryland schizophrenia sample

Ann E. Pulver, Kung‐Yee ‐Y Liang, G. P. Vogler

Research output: Contribution to journalArticlepeer-review

Abstract

In this report we apply methods outlined in the companion paper [Liang, Genet Epidemiol 8:329–338, 1991] to study the association between proband age at onset and familial risk among first‐degree relatives of 374 schizophrenic probands. The analyses take into consideration the potential problems of censoring and correlation of age at onset within families. All analyses were done by gender of the proband; age at onset was dichotomized. The results of the analyses of the male probands suggest that there is an increased risk of schizophrenia among the relatives of male probands who have an onset prior to age 17 when compared to relatives of male probands who have an onset later than 16. We did not find an association between age at onset and familial risk among the female probands, but this may be due to the smaller number of female probands and the lower power associated with the analyses.

Original languageEnglish (US)
Pages (from-to)339-350
Number of pages12
JournalGenetic epidemiology
Volume8
Issue number5
DOIs
StatePublished - 1991

Keywords

  • age at onset
  • familial risk
  • proportional hazards model
  • schizophrenia
  • sex

ASJC Scopus subject areas

  • Epidemiology
  • Genetics(clinical)

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