TABLE 1

Demographic Characteristics of Participants by E-Cigarette Use at Initial Assessment and by Cigarette Use at Follow-up, N = 298

E-Cigarette Use (2014)Cigarette Use (2015)
Overall n (%)aNo n (%)Yes n (%)OR (95% CI)bNo n (%)Yes n (%)OR (95% CI)b
Gender
 Female124 (41.6)63 (50.8)61 (49.2)Ref100 (80.6)24 (19.4)Ref
 Male174 (58.4)89 (51.1)85 (48.9)0.96 (0.60–1.55)123 (70.7)51 (29.3)1.84 (1.04–3.26)
Race/ethnicity
 Hispanic white146 (49.0)74 (50.7)72 (49.3)Ref107 (73.3)39 (26.7)Ref
 Non-Hispanic white126 (42.3)66 (52.4)60 (47.6)0.98 (0.57–1.71)95 (75.4)31 (24.6)0.94 (0.50–1.79)
 Other26 (8.7)12 (46.2)14 (53.8)1.23 (0.49–3.13)21 (80.8)5 (19.2)0.85 (0.27–2.67)
Education (highest parental)
 ≤12th grade86 (30.4)44 (51.2)42 (48.8)1.16 (0.60–2.24)62 (72.1)24 (27.9)1.14 (0.54–2.43)
 Some college100 (35.3)48 (48.0)52 (52.0)1.31 (0.74–2.32)75 (75.0)25 (25.0)1.04 (0.54–2.01)
 College degree or higher97 (34.3)53 (54.6)44 (45.4)Ref73 (75.3)24 (24.7)Ref
Grade
 11160 (53.7)79 (49.4)81 (50.6)Ref121 (75.6)39 (24.4)Ref
 12138 (46.3)73 (52.9)65 (47.1)0.88 (0.55–1.42)102 (73.9)36 (26.1)1.22 (0.70–2.13)
Susceptibility to cigarette use
 Not susceptible216 (73.2)122 (56.5)94 (43.5)Ref175 (81.0)41 (19.0)Ref
 Susceptible79 (26.8)28 (35.4)51 (64.6)2.48 (1.44–4.27)46 (58.2)33 (41.8)3.03 (1.71–5.39)
Others at home use cigarettes
 No242 (81.8)125 (51.7)117 (48.3)Ref181 (74.8)61 (25.2)Ref
 Yes54 (18.2)25 (46.3)29 (53.7)1.24 (0.68–2.24)40 (74.1)14 (25.9)1.04 (0.52–2.06)
Friends use cigarettes
 No231 (82.5)128 (55.4)103 (44.6)Ref180 (77.9)51 (22.1)Ref
 Yes49 (17.5)16 (32.7)33 (67.3)2.61 (1.35–5.06)30(61.2)19 (38.8)2.58 (1.30–5.09)
Friends are friendly to cigarette use
 No217 (73.8)121 (55.8)96 (44.2)Ref164 (75.6)53 (24.4)Ref
 Yes77 (26.2)29 (37.7)48 (62.3)2.13 (1.24–3.65)56 (72.7)21 (27.3)1.15 (0.63–2.10)
  • a Total varies due to missing values.

  • b Adjusted for gender, ethnicity, grade, and highest parental education.