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. Author manuscript; available in PMC: 2020 Nov 1.
Published in final edited form as: Drug Alcohol Depend. 2019 Sep 25;204:107585. doi: 10.1016/j.drugalcdep.2019.107585

Table 2.

Lifetime frequency of e-cigarette use among current e-cigarette users (n=832)1 among middle school students

Mean number of e-cigarette sessions PR 95% CL APR 95% CL
Sex
 Female 13.4 1.00 1.00
 Male 21.8 1.89*** 1.36 2.62 2.46*** 1.75 3.47
FAS (1-9) (mean±SD) 1.16 1.06 1.26 1.13* 1.03 1.24
Smoking status
 Never 12.7 1.00 1.00
 Trial 17.8 1.45* 1.00 2.10 1.16 0.74 1.82
 Occasional smoker 18.1 1.41 0.90 2.20 1.16 0.66 2.03
 Regular smoker (3 or more days) 27.5 2.65*** 1.63 4.30 1.81* 1.03 3.19
Alcohol use
 Neither 10.2 1.00 1.00
 Tried 17.6 1.88 0.95 3.70 1.57 0.84 2.94
 Current 15.3 1.55 0.81 2.93 1.14 0.60 2.17
 Binge 23.4 2.71* 1.37 5.34 1.67 0.87 3.21
Drug use
 No 14.9 1.00 1.00
 Yes 27.6 2.49*** 1.75 3.54 1.89** 1.25 2.86
Technophilia Index
 Quartile 1 13.2 1.00 1.00
 Quartile 2 16.8 1.30 0.83 2.05 1.19 0.75 1.91
 Quartile 3 18.2 1.38 0.87 2.18 1.14 0.68 1.90
 Quartile 4 22.7 1.91* 1.14 3.19 1.84* 1.06 3.19
Sensation seeking (1-5) (mean±SD) 1.42** 1.11 1.82 1.31* 1.02 1.68
Internet advertising
 Neither 16.2 1.00 1.00
 Cigarettes 22.7 1.44 0.81 2.56 1.20 0.62 2.30
 E-cigarette use 14.7 0.89 0.60 1.30 0.76 0.51 1.14
 Both 22.7 1.47 0.99 2.17 1.17 0.72 1.90
Family use of nicotine products
 Neither 15.8 1.00 1.00
 Cigarettes 15.5 0.93 0.62 1.41 0.90 0.60 1.35
 E-cigarette use 28.2 1.99 0.79 5.04 1.72 0.69 4.31
 Both 24.2 1.67 0.96 2.93 1.59 0.91 2.79
Friends use of nicotine products
 Neither 11.4 1.00 1.00
 Cigarettes 15.0 1.49 0.74 2.98 1.13 0.58 2.21
 E-cigarette use 18.0 178 0.92 3.47 1.84 0.98 3.45
 Both 19.6 1.90* 1.06 3.42 1.37 0.74 2.51
Societal approval
 Disapprove 13.9 1.00 1.00
 Neither approve nor disapprove 18.6 1.37 0.87 2.16 1.28 0.75 2.21
 Approve 21.7 1.71** 1.00 2.91 1.40 0.71 2.76
 Don’t know 16.3 1.18 0.72 1.94 1.23 0.69 2.19
Flavor e-cigarette
 Mint 10.0 1.00 1.00
 Fruit 20.0 2.41** 1.33 4.39 1.90* 1.04 3.50
 Tobacco 9.1 0.84 0.40 1.73 0.64 0.25 1.64
 Combined 22.7 2.32*** 1.50 3.58 1.70* 1.07 2.71
 Do not have favorite flavor 14.2 1.68 0.81 3.47 1.49 0.74 3.01
 Other 28.1 3.75*** 1.96 7.18 3.12** 1.57 6.24
Type of liquids
 Liquids without nicotine 15.6 1.00
 Liquids with nicotine 20.1 1.36** 1.03 1.80 1.30 0.96 1.76
*

p value=<0.05,

**

p value=<0.005,

***

p value=<0.001

1.

Analytic sample excluded those who indicated “don’t know” to the question on lifetime frequency (n=119)