TABLE 1

Descriptive Statistics of Demographic Variables

% (n)
Demographic variables
 Sex
  Female51.1 (905)
  Male48.9 (866)
 Age, y
  9–1363.0 (1115)
  14–1637.0 (656)
 Family characteristics
  Living arrangement
   Both parents67.7 (1195)
   Non–2-parent family29.0 (511)
   Other3.3 (59)
  Siblings
   08.7 (152)
   139.0 (682)
   ≥252.3 (915)
 Schooling
  Grades in school
   Sixth26.5 (469)
   Seventh21.5 (380)
   Eighth28.3 (501)
   Ninth23.8 (421)
  Have repeated a grade22.0 (386)
  Schooled in ZEPa19.3 (342)
  Geographic location
   Urban67.0 (1187)
   Rural33.0 (584)
  School academy
   Tours42.1 (746)
   Bordeaux57.9 (1025)
Health variables
 Risk-taking behaviors
  High-risk sports activities currently17.9 (317)
  2-wheeled vehicle risk currently26.3 (465)
 Substance use
  Tobacco experimentation30.6 (541)
  Current tobacco use10.9 (193)
  Alcohol experimentation50.9 (901)
  Current alcohol use32.9 (582)
  Marijuana experimentation7.2 (128)
  Current marijuana use4.0 (71)
 Conduct disorder symptoms
  Conduct disorderb8.4 (149)
 Depressive symptoms
  Depressionc9.4 (164)
 Lifetime participation in the CG
  I have ever participated in the CG9.7 (171)
  • ZEP, Priority Education Zone.

  • a Schools located in ZEP are classified by the Ministry of Education as areas of low socioeconomic status.

  • b Participants with the highest 10% of conduct disorder symptoms (with a score in the ≥90th percentile of symptoms).

  • c Participants with the highest 10% of depressive symptoms (with a score in the ≥90th percentile of symptoms).