AIMS: To examine the direction of the longitudinal association between vulnerability for psychosis and cannabis use throughout adolescence. DESIGN: Cross-lagged path analysis was used to identify the temporal order of vulnerability for psychosis and cannabis use, while controlling for gender, family psychopathology, alcohol use and tobacco use. SETTING: A large prospective population study of Dutch adolescents [the TRacking Adolescents' Individual Lives Survey (TRAILS) study]. PARTICIPANTS: A total of 2120 adolescents with assessments at (mean) age 13.6, age 16.3 and age 19.1. MEASUREMENTS: Vulnerability for psychosis at the three assessment points was represented by latent factors derived from scores on three scales of the Youth Self-Report and the Adult Self-Report, i.e. thought problems, social problems and attention problems. Participants self-reported on cannabis use during the past year at all three waves. FINDINGS: Significant associations (r = 0.12-0.23) were observed between psychosis vulnerability and cannabis use at all assessments. Also, cannabis use at age 16 predicted psychosis vulnerability at age 19 (Z = 2.6, P < 0.05). Furthermore, psychosis vulnerability at ages 13 (Z = 2.0, P < 0.05) and 16 (Z = 3.0, P < 0.05) predicted cannabis use at, respectively, ages 16 and 19. CONCLUSIONS: Cannabis use predicts psychosis vulnerability in adolescents and vice versa, which suggests that there is a bidirectional causal association between the two.
AIMS: To examine the direction of the longitudinal association between vulnerability for psychosis and cannabis use throughout adolescence. DESIGN: Cross-lagged path analysis was used to identify the temporal order of vulnerability for psychosis and cannabis use, while controlling for gender, family psychopathology, alcohol use and tobacco use. SETTING: A large prospective population study of Dutch adolescents [the TRacking Adolescents' Individual Lives Survey (TRAILS) study]. PARTICIPANTS: A total of 2120 adolescents with assessments at (mean) age 13.6, age 16.3 and age 19.1. MEASUREMENTS: Vulnerability for psychosis at the three assessment points was represented by latent factors derived from scores on three scales of the Youth Self-Report and the Adult Self-Report, i.e. thought problems, social problems and attention problems. Participants self-reported on cannabis use during the past year at all three waves. FINDINGS: Significant associations (r = 0.12-0.23) were observed between psychosis vulnerability and cannabis use at all assessments. Also, cannabis use at age 16 predicted psychosis vulnerability at age 19 (Z = 2.6, P < 0.05). Furthermore, psychosis vulnerability at ages 13 (Z = 2.0, P < 0.05) and 16 (Z = 3.0, P < 0.05) predicted cannabis use at, respectively, ages 16 and 19. CONCLUSIONS: Cannabis use predicts psychosis vulnerability in adolescents and vice versa, which suggests that there is a bidirectional causal association between the two.
Authors: R F Farmer; D B Kosty; J R Seeley; S C Duncan; M T Lynskey; P Rohde; D N Klein; P M Lewinsohn Journal: Psychol Med Date: 2014-05-12 Impact factor: 7.723
Authors: Benedetto Vitiello; Guillermo Perez Algorta; L Eugene Arnold; Andrea L Howard; Annamarie Stehli; Brooke S G Molina Journal: J Am Acad Child Adolesc Psychiatry Date: 2017-02-04 Impact factor: 8.829
Authors: Derek B Kosty; Richard F Farmer; John R Seeley; Jeff M Gau; Susan C Duncan; Peter M Lewinsohn Journal: Addiction Date: 2015-04-27 Impact factor: 6.526
Authors: Sarah M Hartz; Carlos N Pato; Helena Medeiros; Patricia Cavazos-Rehg; Janet L Sobell; James A Knowles; Laura J Bierut; Michele T Pato Journal: JAMA Psychiatry Date: 2014-03 Impact factor: 21.596