TABLE 2

Reasons for First Trying E-Cigarettes (Fall 2013) Predicting the Number of Days of E-Cigarette Use in the Past Month (Spring 2014)

Reasons For Trying E-CigarettesIndependent ModelsMultivariable Models
UnadjustedAdjustedUnadjustedAdjusted
B (SE)βB (SE)βB (SE)βB (SE)β
Interest
 Curiosity–3.48 (1.79)–0.16*−1.98 (1.75)−0.10−0.69 (1.80)−0.03−1.67 (1.90)−0.08
 It is cool−3.55 (2.84)−0.10−1.62 (2.56)−0.05−1.06 (2.84)−0.03−0.24 (2.84)−0.01
Desirable attributes
 Good flavors4.36 (1.81)0.20*2.04 (1.76)0.102.90 (2.00)0.140.69 (2.08)0.03
 Does not smell bad2.74 (2.04)0.123.05 (1.86)0.13−5.71 (2.92)−0.24−1.15 (3.10)−0.04
 Hide from adults6.23 (2.36)0.22**4.38 (2.27)0.150.72 (2.64)0.022.46 (2.60)0.08
 Low cost10.72 (2.36)0.36**7.52 (2.34)0.25*8.77 (3.01)0.30*7.02 (3.24)0.23*
Social norms
 Friends use0.78 (1.90)0.040.62 (1.73)0.031.51 (1.93)0.060.78 (1.93)0.04
 Parents/family use−3.62 (3.22)−0.10−0.22 (3.08)−0.01−1.86 (3.22)−0.050.24 (3.24)0.01
 Can use anywhere7.17 (1.90)0.30**2.95 (1.94)0.124.46 (2.52)0.190.10 (2.66)0.01
Goal-directed
 To quit smoking cigarettes8.86 (2.55)0.28**4.86 (2.70)0.166.96 (2.62)0.22*3.58 (3.08)0.12
 Healthier than cigarettes3.44 (1.92)0.151.90 (1.78)0.080.36 (1.98)0.020.02 (2.07)0.001
  • Reasons are coded yes = 1, no = 0. All models controlled for school status (middle school versus high school). Independent models reflect estimates when reasons are entered into separate linear regression models. Multivariable models reflect estimates when reasons are entered simultaneously into the same linear regression model. Results for covariates in final adjusted model: middle school (versus high school), B = 10.19, SE = 3.30, β = 0.24, P = .003; female (vs male), B = –1.61, SE = 1.74, β = –0.08, P = .36; white (vs. non-white), B = –1.48, SE = 2.44, β = –0.04, P = .54; traditional cigarette use in the past month at wave 1, B = 4.86, SE = 1.94, β = 0.23, P = .01; other tobacco use in the past month at wave 1, B = –3.24, SE = 1.86, β = –0.16, P = .08; e-cigarette frequency in the past month at wave 1, B = 0.40, SE = 0.11, β = 0.36, P = .001.

  • Similar results are seen if including age instead of school status (middle school versus high school) in the model; age is negatively related to the frequency of e-cigarette use, B = –1.97, SE = 0.73, β = –0.26, P = .008.

  • * P ≤ .05.

  • ** P ≤ .01.