Nicotine Dependence in Teens Study

Overview

Acronym
NDIT
Website
NDIT
Investigators
  • Dr. Gilles Paradis
    McGill University
  • Dr. Rachel Tyndale
    University of Toronto
  • MD. Joseph DiFranza
    University of Massachusetts Medical School
  • Dr. James Hanley
    McGill University
  • Dr. André Gervais
    Direction de santé publique de Montréal
Contacts
  • Jennifer O'Loughlin
    CHUM Research Centre

General Design

Study design
Cohort
Start Year
1999
End Year
2013
General Information on Follow Up (profile, frequency)

Baseline self-report questionnaires were completed during class time at school in autumn 1999 in nine schools and in autumn 2000 in one school. Follow-up questionnaires were completed every 3 months thereafter during the 10-month school year for the next 5 years (1999–2005) until NDIT participants completed grade 11 and graduated from high school, for a total of 20 survey cycles during high school. In 2007–08, when NDIT participants were age 20 years on average, they completed self-report questionnaires that were mailed to their homes with a stamped addressed return envelope (i.e. survey cycle 21). Finally, NDIT participants completed a self-report questionnaire administered in the NDIT research offices in 2011–12 when they were age 24 years on average (i.e. survey cycle 22).

Recruitment Target
  • Individuals
Number of Participants
1,294
Number of Participants with Biological Samples
962

Access

Availability of data and biosamples

Possible Access to Data
Possible Access to Biosamples
Other

Marker Paper

O'Loughlin J, Dugas EN, et al. Cohort Profile: The Nicotine Dependence in Teens (NDIT) Study. International journal of epidemiology, 2014; pii: dyu135.

PUBMED 25022274

Supplementary Information

Access to data and biological data is available to university-appointed or affiliated investigators and to masters, doctoral and postdoctoral students, through their primary supervisor (www.nditstudy.ca).

Timeline

Population

NDIT population

Selection Criteria

Countries
  • Canada
Territory

Montreal

Other Criteria

Grade 7 students.

Sources of Recruitment

General Population
  • Volunteer enrolment

Sample Size

Number of Participants
1,294
Number of Participants with Biological Samples
962
Supplementary Information

Cycle 1: Questionnaire (1267 participants) and physical measures (1195 participants)

Cycle 2: Questionnaire (1198 participants)

Cycle 3: Questionnaire (1191 participants)

Cycle 4: Questionnaire (545 participants)

Cycle 5: Questionnaire (1104 participants)

Cycle 6: Questionnaire (1101 participants)

Cycle 7: Questionnaire (960 participants)

Cycle 8: Questionnaire (982 participants)

Cycle 9: Questionnaire (1022 participants)

Cycle 10: Questionnaire (995 participants)

Cycle 11: Questionnaire (972 participants) and blood samples (523 participants)

Cycle 12: Questionnaire (987 participants), physical measures (955 participants) and 10 school questionnaires completed by school administrator and/or teacher

Cycle 13: Questionnaire (914 participants)

Cycle 14: Questionnaire (906 participants)

Cycle 15: Questionnaire (904 participants)

Cycle 16: Questionnaire (887 participants) and environmental scans (171)

Cycle 17: Questionnaire (871 participants)

Cycle 18: Questionnaire (853 participants)

Cycle 19: Questionnaire (844 participants) and physical measures (804 participants)

Cycle 20: Questionnaire (840 participants)

Cycle 21: Questionnaire (880 participants) and saliva samples (336 participants)

Parent questionnaires: Mother questionnaire (597 mothers), father questionnaire (479 fathers), questionnaire about NDIT participants (648 mothers/fathers) and saliva samples (822 parents)

Cycle 22: Questionnaire (858 participants), saliva samples (103 participants), diet history questionnaire (363 participants), physical measures (781 participants), wearing accelerometers (341 participants) and saliva samples for cotinine (236 smoking participants)

Data Collection Events

# Name Description Start End
0 NDIT - Physical measures 1 1999 (September) 1999 (September)
1 NDIT - Questionnaire follow-up during high school 1999 (September) 2004 (June)
2 NDIT - Blood samples 1 2002 (March) 2002 (March)
3 NDIT - School questionnaire 2002 (June) 2002 (June)
4 NDIT - Physical measures 2 2002 (June) 2002 (June)
5 NDIT - Environmental scans 2003 (June) 2003 (June)
6 NDIT - Physical measures 3 2004 (March) 2004 (March)
7 NDIT - 3 years post high school 2007 2008
8 NDIT - Parent questionnaire 2009 2010
9 NDIT - 6 years post high school 2011 2012

Individual Studies Included

Acronym Name Study design Participants Countries

Harmonization Projects Included

Acronym Name

Networks

Acronym Name Studies

Datasets

Name Type Data Collection Events Variables
Last Update: 2021-05-05 21:18