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. 2015 Aug 26;10(8):e0134734. doi: 10.1371/journal.pone.0134734

Table 3. SEM results: Direct effects for Cigarette Experimentation among middle and high school students, NYTS, 2012 a .

Outcome Variable Explanatory Variable B b 95% CI Z P β c
Internet Static exposure d 1.00 0.76
Newspaper/ magazine Static exposure 1.06 1.03, 1.08 77.95 < .001 0.80
Retail store Static exposure 0.75 0.73, 0.78 57.67 < .001 0.57
Cigarettes Perception of peer tobacco use e 1.00 0.87
Noncigarette Perception of peer tobacco use 1.03 0.97, 1.06 45.39 < .001 0.87
Perception of peer tobacco use Static exposure 0.79 0.28, 1.29 3.07 .002 0.22
Perception of peer tobacco use TV/movie exposure f 0.07 -0.20, 0.33 0.49 .623 0.03
Perception of peer tobacco use Household member tobacco use g 0.50 0.41, 0.59 10.86 < .001 0.15
Perception of peer tobacco use Sex -0.50 -0.60,-.40 -9.89 < .001 -0.09
Perception of peer tobacco use Grade 0.46 0.31, 0.61 5.99 < .001 0.34
Perception of peer tobacco use Black 2.07 -9.43, 13.57 0.35 .727 0.26
Perception of peer tobacco use Hispanic 1.15 -19.54, 21.84 0.11 .913 0.18
Perception of peer tobacco use Other -0.52 -38.27, 37.22 -0.03 .978 -0.06
Experimentation h Static exposure 0.10 -0.03, 0.23 1.50 .135 0.08
Experimentation Perception of peer tobacco use 0.08 -0.01, 0.17 1.68 .096 0.22
Experimentation TV/movie exposure 0.02 -0.04, 0.08 0.59 .554 0.02
Experimentation Household member tobacco use 0.26 0.14, 0.38 4.37 < .001 0.21
Experimentation Sex 0.12 0.06, 0.19 3.78 < .001 0.06
Experimentation Grade 0.14 0.08, 0.20 4.47 < .001 0.27
Experimentation Black -0.12 -3.87, 3.62 -0.06 .950 -0.04
Experimentation Hispanic 0.67 -3.81, 5.14 0.29 .769 0.27
Experimentation Other 0.83 -6.75, 8.40 0.21 .830 0.25

SEM, Structural Equation Model

NYTS, National Youth Tobacco Survey

a Multivariate N = 24,654 based on all available cases across all variables used in analyses.

b B = unstandardized regression coefficient, which represents the amount of change in the dependent variable per one-unit change in the independent variable.

c β = standardized regression coefficient, which represents the SD change in the dependent variable per SD change in the independent variable.

d Static exposure was defined as exposure to static tobacco advertisements on the Internet, in newspaper and magazines or retail stores.

e Perception of peer tobacco use measured by student response to the questions (1) “Out of every 10 students in your grade at school, how many do you think smoke cigarettes?” and (2) “Out of every 10 students in your grade at school, how many do you think use tobacco products other than cigarettes?”

f TV and movie exposure was defined as exposure to tobacco use in TV and movies.

g Household member tobacco use was defined as number of tobacco products used by a family member or those living with the respondent.

h Experimentation was defined as having puffed on a cigarette at least once but not having smoked a total of 100 lifetime cigarettes.