TABLE 1

Sample Characteristics of Ninth-Grade Never-Marijuana Users (N = 2688) by Baseline Ever-Tobacco Use Status

Baseline CharacteristicsaTotal (N = 2668)Baseline Tobacco Product UseP
Never (n = 2188)Ever (n = 480)
Sex, n (%)
 Female1450 (54.3)1205 (55.1)245 (51.0).11b
 Male1218 (45.7)983 (44.9)235 (49.0)
Age, mean (SD)14.56 (0.40)14.55 (0.39)14.61 (0.43).10c
Race and/or ethnicity, n (%)
 Hispanic1194 (45.3)968 (44.7)226 (48.1).12b
 Asian American627 (23.8)534 (24.7)93 (19.8)
 White448 (17.0)372 (17.2)76 (16.2)
 African American130 (4.9)106 (4.9)24 (5.1)
 Other237 (9.0)186 (8.6)51 (10.9)
Parental college education, n (%)1247 (53.6)1060 (55.5)187 (44.7)<.001b
Environmental factors, n (%)
 Lives with both biological parents1786 (67.2)1501 (68.9)285 (59.6)<.001b
 Family history of smoking1580 (61.7)1251 (59.5)329 (71.5)<.001b
 Family history of drug use399 (15.6)300 (14.3)99 (21.6)<.001b
 Peer combustible cigarette use332 (12.7)221 (10.3)111 (23.7)<.001b
 Peer marijuana use698 (26.7)468 (21.8)230 (49.0)<.001b
Interpersonal factors, mean (SD)
 TCI Impulsivity subscale 2.43 (1.47)2.34 (1.49)2.80 (1.37).004c
 CESD14.04 (11.44)13.31 (10.99)16.88 (12.45)<.001c
  • a Totals vary because of missing values.

  • b Calculated by using the χ2 test.

  • c Calculated by using the independent samples t test.