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Table 3 Baseline characteristics of participants, NDIT 1999-2005.

From: A prognostic tool to identify adolescents at high risk of becoming daily smokers

Characteristics

1-year risk

analysis

(n = 3467)*

2-year

Database

(n = 1570)†

Male, %

49.4

48.0

Age (years), mean (sd‡)

14.0 (1.1)

13.5 (1.0)

Felt like you really need a cigarette, %

15.5

14.7

Parent(s) smoke, %

29.5

29.8

Sibling(s) smoke, %

17.6

15.7

A few or more friends smoke, %

53.0

45.9

Alcohol use, %

48.1

45.6

Had previously smoked, %

40.6

35.4

  1. * Includes up to four observations per participant.
  2. † Includes up to two observations per participant.
  3. ‡ Standard deviation