AIMS: To investigate the hypothesis that changes in cannabis prevalence among Dutch secondary school students (aged 12-17 years) were paralleled by shifts in the age of first cannabis use. DESIGN AND PARTICIPANTS: Data were derived from five waves (1988, 1992, 1996, 1999 and 2003) of the Dutch National School Survey on Substance Use, a nationally representative cross-sectional study, with a total of 32,777 respondents. MEASUREMENTS: Written questionnaires on cannabis, tobacco, alcohol, other drug use and socio-demographic and behavioural variables were administered in classroom settings. FINDINGS: Survival analysis showed a strong increase in cumulative incidences by age of first cannabis use from 1988 to 1992, a further increase in 1996 and stabilization in 1999, continuing into 2003. From 1992 to 1996, age of onset shifted towards younger ages. Onset peaked at age 15 in 1992 and age 14 in 1996. The proportion of life-time cannabis users starting at age 13 or younger increased from 26% in 1992 to 41% in 1996. The overall trend was similar for boys and girls. CONCLUSIONS: The study largely confirmed the expectation that the increase in cannabis use from 1988 to 1996 was paralleled by a decrease in the age of first cannabis use. From 1996 to 2003 age of first cannabis use and prevalence stabilized, possibly occasioned by a change in cannabis policy in the mid-1990s.
AIMS: To investigate the hypothesis that changes in cannabis prevalence among Dutch secondary school students (aged 12-17 years) were paralleled by shifts in the age of first cannabis use. DESIGN AND PARTICIPANTS: Data were derived from five waves (1988, 1992, 1996, 1999 and 2003) of the Dutch National School Survey on Substance Use, a nationally representative cross-sectional study, with a total of 32,777 respondents. MEASUREMENTS: Written questionnaires on cannabis, tobacco, alcohol, other drug use and socio-demographic and behavioural variables were administered in classroom settings. FINDINGS: Survival analysis showed a strong increase in cumulative incidences by age of first cannabis use from 1988 to 1992, a further increase in 1996 and stabilization in 1999, continuing into 2003. From 1992 to 1996, age of onset shifted towards younger ages. Onset peaked at age 15 in 1992 and age 14 in 1996. The proportion of life-time cannabis users starting at age 13 or younger increased from 26% in 1992 to 41% in 1996. The overall trend was similar for boys and girls. CONCLUSIONS: The study largely confirmed the expectation that the increase in cannabis use from 1988 to 1996 was paralleled by a decrease in the age of first cannabis use. From 1996 to 2003 age of first cannabis use and prevalence stabilized, possibly occasioned by a change in cannabis policy in the mid-1990s.
Authors: Ron de Graaf; Mirjana Radovanovic; Margriet van Laar; Brian Fairman; Louisa Degenhardt; Sergio Aguilar-Gaxiola; Ronny Bruffaerts; Giovanni de Girolamo; John Fayyad; Oye Gureje; Josep Maria Haro; Yueqin Huang; Stanislav Kostychenko; Jean-Pierre Lépine; Herbert Matschinger; Maria Elena Medina Mora; Yehuda Neumark; Johan Ormel; Jose Posada-Villa; Dan J Stein; Hisateru Tachimori; J Elisabeth Wells; James C Anthony Journal: Am J Epidemiol Date: 2010-06-09 Impact factor: 4.897
Authors: Ron de Graaf; Margreet ten Have; Coen van Gool; Saskia van Dorsselaer Journal: Soc Psychiatry Psychiatr Epidemiol Date: 2011-01-01 Impact factor: 4.328
Authors: H-U Wittchen; S Behrendt; M Höfler; A Perkonigg; R Lieb; G Bühringer; K Beesdo Journal: Int J Methods Psychiatr Res Date: 2008-06 Impact factor: 4.035
Authors: Monique Malmberg; Geertjan Overbeek; Karin Monshouwer; Jeroen Lammers; Wilma A M Vollebergh; Rutger C M E Engels Journal: J Behav Med Date: 2010-07-13
Authors: Monique Malmberg; Marloes Kleinjan; Ad A Vermulst; Geertjan Overbeek; Karin Monshouwer; Jeroen Lammers; Rutger C M E Engels Journal: J Youth Adolesc Date: 2012-05-24
Authors: Camelia C Minică; Karin J H Verweij; Peter J van der Most; Hamdi Mbarek; Manon Bernard; Kristel R van Eijk; Penelope A Lind; Meng Zhen Liu; Dominique F Maciejewski; Teemu Palviainen; Cristina Sánchez-Mora; Richard Sherva; Michelle Taylor; Raymond K Walters; Abdel Abdellaoui; Timothy B Bigdeli; Susan J T Branje; Sandra A Brown; Miguel Casas; Robin P Corley; George Davey-Smith; Gareth E Davies; Erik A Ehli; Lindsay Farrer; Iryna O Fedko; Iris Garcia-Martínez; Scott D Gordon; Catharina A Hartman; Andrew C Heath; Ian B Hickie; Matthew Hickman; Christian J Hopfer; Jouke Jan Hottenga; René S Kahn; Jaakko Kaprio; Tellervo Korhonen; Henry R Kranzler; Ken Krauter; Pol A C van Lier; Pamela A F Madden; Sarah E Medland; Michael C Neale; Wim H J Meeus; Grant W Montgomery; Ilja M Nolte; Albertine J Oldehinkel; Zdenka Pausova; Josep A Ramos-Quiroga; Vanesa Richarte; Richard J Rose; Jean Shin; Michael C Stallings; Tamara L Wall; Jennifer J Ware; Margaret J Wright; Hongyu Zhao; Hans M Koot; Tomas Paus; John K Hewitt; Marta Ribasés; Anu Loukola; Marco P Boks; Harold Snieder; Marcus R Munafò; Joel Gelernter; Dorret I Boomsma; Nicholas G Martin; Nathan A Gillespie; Jacqueline M Vink; Eske M Derks Journal: Addiction Date: 2018-08-19 Impact factor: 6.526
Authors: Marta Di Forti; Hannah Sallis; Fabio Allegri; Antonella Trotta; Laura Ferraro; Simona A Stilo; Arianna Marconi; Caterina La Cascia; Tiago Reis Marques; Carmine Pariante; Paola Dazzan; Valeria Mondelli; Alessandra Paparelli; Anna Kolliakou; Diana Prata; Fiona Gaughran; Anthony S David; Craig Morgan; Daniel Stahl; Mizanur Khondoker; James H MacCabe; Robin M Murray Journal: Schizophr Bull Date: 2013-12-17 Impact factor: 9.306