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. Author manuscript; available in PMC: 2018 Aug 1.
Published in final edited form as: Drug Alcohol Depend. 2017 May 19;177:14–22. doi: 10.1016/j.drugalcdep.2017.03.017

Table 3.

Demand parameters alpha and Q0 for each frequency group by task type. Reported values are average group values (±SEM). Values for cigarettes alone and cigarettes + e-cigarettes available are derived from individual demand curve fits. Values for e-cigarettes alone are derived from group curve fits.

Alpha (±SEM) Q0(±SEM)

Cigs Alone

Daily 0.048 (0.0093) ^ 25.44 (1.76)

Weekly 0.039 (0.0074) 29.51 (3.30)

Monthly 0.070 (0.022)^ 26.17 (2.36)

Less than once in 6 months 0.066 (0.028) 26.19 (2.44)

Never users 0.033 (0.0060)*# 27.47 (1.67)


E-cigs Alone

Daily 0.0063 (0.00048)#$ 9.61 (0.33)&^

Weekly 0.0063 (0.00058)#$ 12.53 (0.48)*#$

Monthly 0.0091 (0.00081)*&$^ 8.08 (0.31)&^

Less than once in 6 months 0.013 (0.00097)*&#^ 8.23 (0.23)&^

Never users 0.0056 (0.00064)#$ 13.94 (0.66)*#$

Cigs + e-cigs Available

Daily 0.084 (0.016)^ 21.07 (2.16)

Weekly 0.052 (0.012)^ 23.47 (1.84)

Monthly 0.041 (0.011) 23.96 (2.46)

Less than once in 6 months 0.048 (0.017) 21.16 (1.60)

Never users 0.024 (0.005)*& 22.18 (2.20)

*

p<0.05 difference from Daily group.

&

p<0.05 difference from Weekly group.

#

p<0.05 difference from Monthly group.

$

p<0.05 difference from Less than once in 6 months group.

^

p<0.05 difference from the Never users group.