Nicotine Dependence in Teens Study
The Nicotine Dependence in Teens (NDIT) Study is a prospective cohort investigation of adolescents conducted in Montreal.
NDIT aimed to describe the natural course of cigarette smoking and nicotine dependence (ND) in novice smokers, to measure the intensity of ND symptoms in relation to cigarette smoking and to investigate the importance of a wide range of individual-level and contextual factors in the initiation of smoking and ND.
In addition to its primary objectives, NDIT has embedded studies on obesity, blood pressure, physical activity team sports, sedentary behaviour, diet, genetics, alcohol use, use of illicit drugs, second-hand smoke, gambling, sleep and mental health.
Overview
- Acronym
- NDIT
- Website
- NDIT
- Investigators
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- Contacts
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General Design
- Study design
- Cohort
- Start - End Year
- 1999 - 2013
- General Information on Follow Up (profile, frequency)
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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
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- 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 |
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Marker Papers
O'Loughlin J, Dugas EN, et al. Cohort Profile: The Nicotine Dependence in Teens (NDIT) Study. International journal of epidemiology, 2014; pii: dyu135.
PUBMED 25022274Supplementary 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
The population is composed of students recruited in 1999–2000 from all grade 7 classes in a convenience sample of 10 high schools in Montreal, Canada.
Selection Criteria
- Countries
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- Canada
- Canadian Provinces
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- Quebec
- Territory
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Montreal
- Other Criteria
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Grade 7 students.
Sources of Recruitment
- General Population
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- Volunteer enrolment
Sample Size
- Number of Participants
- 1,294
- Number of Participants with Biological Samples
- 962
- Supplementary Information about selection criteria
-
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 | Data sources | Data sources - Biosamples | Start | End |
|---|---|---|---|---|---|
| 0 | NDIT - Physical measures 1 |
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1999 (September) | 1999 (September) | |
| 1 | NDIT - Questionnaire follow-up during high school |
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1999 (September) | 2004 (June) | |
| 2 | NDIT - Blood samples 1 |
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|
2002 (March) | 2002 (March) |
| 3 | NDIT - School questionnaire |
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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 |
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2004 (March) | 2004 (March) | |
| 7 | NDIT - 3 years post high school |
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2007 | 2008 |
| 8 | NDIT - Parent questionnaire |
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2009 | 2010 |
| 9 | NDIT - 6 years post high school |
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2011 | 2012 |
Participating Studies
| Acronym | Name | Study design | Countries |
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Harmonization Initiatives Included
| Acronym | Name |
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Datasets
| Name | Data Collection Events | Variables |
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Areas of Information Collected
- Socio-demographic and economic characteristics
- Death
- Lifestyle and behaviours
- Physical measures and assessments
- Birth, pregnancy and reproductive health history
- Laboratory measures
- Perception of health, quality of life, development and functional limitations
- Cognition, personality and psychological measures and assessments
- Diseases
- Life events, life plans, beliefs and values
- Symptoms and signs
- Preschool, school and work life
- Medication and supplements
- Social environment and relationships
- Non-pharmacological interventions
- Physical environment
- Health and community care services utilization
- Administrative information
Variables Content Summary
Areas of Information Collected
Areas of Information Collected per per Population and Data Collection Event
Networks
| Acronym | Name | Harmonization Initiatives | Individual Studies |
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