title: Relationship between frequency and intensity of cigarette smoking and TTFC/C among students of the GYTS in select countries, 2007-2009.
abstract: BACKGROUND
  This study assessed the construct validity of a measure of nicotine dependence that was used in the Global Youth Tobacco Survey (GYTS).
  
  
  METHODS
  Using 2007-2009 data from the GYTS, subjects from 6 countries were used to assess current smokers' odds of reporting time to first cigarette or craving positive (TTFC/C+) by the number of cigarette smoking days per month (DPM) and the number of cigarettes smoked per day (CPD).
  
  
  RESULTS
  The percentage of GYTS smokers who reported TTFC/C+ ranged from 58.0% to 69.7%. Compared with students who smoked on 1-2 DPM, those who smoked on 3-9 DPM had 3 times the adjusted odds of reporting TTFC/C+. The adjusted odds of reporting TTFC/C+ were 3 to 7 times higher among those who smoked 10-29 DPM and 6 to 20 times higher among daily smokers. Similarly, the adjusted odds of TTFC/C+ were 3-6 times higher among those who smoked 2-5 CPD and 6 to 20 times higher among those who smoked >6 CPD, compared to those who smoked <1 CPD.
  
  
  CONCLUSIONS
  Associations of TTFC/C+ prevalence with both frequency and intensity of cigarette smoking provide a construct validation of the GYTS question used to assess respondents' TTFC/C status.
authors.affiliation: Epidemic Intelligence Service, Office of Surveillance, Epidemiology, and Laboratory Services, Centers for Disease Control and Prevention, 1600 Clifton Road NE, Atlanta, GA, 30329. elam@cdc.gov.
authors.forename: Eugene
authors.initials: E
authors.lastname: Lam
authors.forename: Gary A
authors.initials: GA
authors.lastname: Giovino
authors.forename: Mikyong
authors.initials: M
authors.lastname: Shin
authors.forename: Kyung A
authors.initials: KA
authors.lastname: Lee
authors.forename: Italia
authors.initials: I
authors.lastname: Rolle
authors.forename: Samira
authors.initials: S
authors.lastname: Asma
mesh_terms: D000293:Adolescent; D000294:Adolescent Behavior; D017677:Age Distribution; D001118:Argentina / Q000453:epidemiology; D005260:Female; D006306:Health Surveys / Q000592:standards*; D006801:Humans; D007597:Jordan / Q000453:epidemiology; D016015:Logistic Models; D008296:Malaysia / Q000453:epidemiology; D008297:Male; D015995:Prevalence; D015203:Reproducibility of Results; D012574:Schools; D017678:Sex Distribution; D018154:Slovakia / Q000453:epidemiology; D012907:Smoking / Q000453:epidemiology*; D016540:Smoking Cessation / Q000706:statistics & numerical data; D013019:South Africa / Q000453:epidemiology; D011795:Surveys and Questionnaires / Q000592:standards; D013785:Thailand / Q000453:epidemiology; D014944:World Health Organization; D014026:Nicotiana
keywords: Global Youth Tobacco Survey; nicotine dependence; smoking