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. Author manuscript; available in PMC: 2020 Feb 19.
Published in final edited form as: Addiction. 2019 Feb 15;114(Suppl 1):123–133. doi: 10.1111/add.14538

Table 3.

Parameter estimates for demand indices.

Intensity Pmax Breakpoint Elasticity

B SE p-value B SE p-value B SE p-value B SE p-value
Intercept 0.72 0.03 <.001 3.50 0.46 <.001 7.07 0.57 <.001 −1.59 0.04 <.001

Smoking Status
Daily smokers 0.43 0.01 <.001 1.61 0.24 <.001 3.88 0.29 <.001 −0.61 0.02 <.001
Non-daily smokers ref ref ref ref

Vaping Status
Daily vapers 0.21 0.04 <.001 −0.24 0.71 0.74 0.61 0.88 0.49 −0.20 0.06 0.001
Non-daily vapers 0.10 0.04 0.008 0.74 0.63 0.24 1.43 0.79 0.07 −0.11 0.05 0.04
Non-vapers ref ref ref ref

Country
Canada −0.06 0.01 <.001 0.79 0.25 0.002 1.66 0.31 <.001 0.03 0.02 0.10
United States −0.08 0.02 <.001 1.61 0.28 <.001 2.47 0.34 <.001 −0.01 0.02 0.81
England −0.08 0.01 <.001 1.87 0.25 <.001 2.42 0.32 <.001 0.00 0.02 0.88
Australia ref ref ref ref

Sex
Female −0.05 0.01 <.001 0.04 0.01 0.001 0.40 0.16 0.01 0.01 0.01 0.49
Male ref ref ref ref

Income
Don’t know 0.00 0.02 0.93 −0.41 0.38 0.28 0.12 0.48 0.81 0.03 0.03 0.40
Low income 0.04 0.01 0.002 −0.61 0.21 0.004 −0.98 0.26 <.001 0.04 0.02 0.04
Moderate income 0.02 0.01 0.07 −0.36 0.19 0.06 −0.38 0.23 0.10 0.01 0.02 0.38
High income ref ref ref ref

Education
Don’t know 0.04 0.05 0.38 2.62 0.84 0.002 2.26 1.05 0.03 −0.29 0.07 <.001
Low education 0.09 0.01 <.001 −0.59 0.23 0.01 −0.45 0.29 0.12 −0.07 0.02 <.001
Moderate education 0.06 0.01 <.001 −0.05 0.21 0.80 −0.07 0.26 0.80 −0.06 0.02 0.001
High education ref ref ref ref

Ethnicity
Don’t know ethnicity 0.08 0.05 0.07 −1.26 0.80 0.12 −2.29 0.99 0.02 0.07 0.07 0.28
Majority 0.09 0.01 <.001 −0.60 0.24 0.01 −0.77 0.30 0.01 −0.07 0.02 0.001
Minority ref ref ref ref

Age
18-24 −0.01 0.02 0.70 0.10 0.26 0.70 1.58 0.32 <.001 0.10 0.02 <.001
25-39 −0.04 0.01 0.004 0.02 0.21 0.92 0.78 0.27 0.003 0.08 0.02 <.001
40-54 0.00 0.01 0.78 0.12 0.22 0.59 0.64 0.27 0.02 −0.01 0.02 0.54
55 and up ref ref ref ref

Motivation to quit smoking
Don’t know 0.02 0.04 0.52 0.28 0.66 0.67 0.46 0.81 0.57 0.04 0.05 0.43
Not at all 0.02 0.02 0.23 1.80 0.31 <.001 2.12 0.38 <.001 −0.11 0.03 <.001
A little −0.02 0.01 0.21 0.53 0.22 0.02 0.49 0.28 0.08 0.04 0.02 0.045
Somewhat 0.00 0.01 0.73 0.68 0.18 <.001 1.14 0.22 <.001 −0.02 0.02 0.19
A lot ref ref ref ref

Confidence to quit smoking
Don’t know −0.30 0.06 <.001 −0.72 0.98 0.46 −2.04 1.22 0.10 0.34 0.08 <.001
Very easy −0.38 0.02 <.001 −2.03 0.42 <.001 −4.92 0.52 <.001 0.48 0.03 <.001
Somewhat easy −0.25 0.02 <.001 −2.10 0.30 <.001 −3.58 0.38 <.001 0.35 0.03 <.001
Neither easy nor hard −0.18 0.02 <.001 −1.37 0.28 <.001 −2.59 0.34 <.001 0.23 0.02 <.001
Somewhat hard −0.13 0.01 <.001 −1.17 0.18 <.001 −2.02 0.22 <.001 0.18 0.01 <.001
Very hard ref ref ref ref