TABLE 1

Characteristics of Participants (n = 2266 Observations of 842 Participants; NDIT Study, 1999–2005)

CharacteristicMean (SD) or %
Male sex, %47.8
Age, y, mean (SD)13.8 (1.1)
University-educated mother, %48.0
Single-parent family, %7.5
Parent(s) smoke, %24.3
Sibling(s) smoke, %10.8
Friend(s) smoke, %38.1
Consumes alcohol, %35.6
Participates in team sports, %63.2
Feels the need for a cigarette, %3.2
Hard not to smoke when others are smoking, %9.3
Worry or stress about loneliness, %23.8
Worry or stress about wt, %29.1
Feels hopeless about the future, %27.0
Worry or stress about relationship with siblings, %26.8
Worry or stress about a health problem, %23.1
Has something valuable to offer, %94.0
Has a positive attitude toward oneself, %91.4
  • Includes up to 4 observations per participant.