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. 2015 Jul 24;10(7):e0133570. doi: 10.1371/journal.pone.0133570

Table 1. Sample characteristics.

Hardcore smokers (n = 510) Non-hardcore smokers (n = 338) Significance
Demographics
Female, n (%) 50.4 56.2 NS
Age (SD) 52.7 (7.2) 51.6 (7.7) p = .031
Socioeconomic status (%) a
Low 56.5 54.7 NS
High 43.5 45.3
Smoking History
Age of smoking onset (SD) 16.3 (5.5) 17.2 (4.9) p = .021
Years smoked in life (SD) b 35.4 (8.4) 31.2 (10.2) p < .001
Nicotine dependence
FTND (SD) 5.3 (1.8) 3.1 (2.4) p < .001
Cigarettes per day (SD) 21.2 (6.6) 11.1 (8.4) p < .001
Intention to quit (%)
Within 1 year 11.6 23.4 p < .001
Within 5 years 18.0 13.0
Not quitting, but smoking less 32.4 34.6
Not quitting, not smoking less 38.0 29.0
Smoking-related beliefs
Quitting self-efficacy (SD) c 3.8 (1.1) 4.2 (1.0) p < .001
Pros of smoking (SD) 3.5 (0.7) 3.3 (0.7) p < .001
Cons of smoking (SD) 4.5 (0.8) 4.4 (0.8) p = .026
Pros of quitting (SD) 4.5 (0.8) 4.5 (0.9) NS
Cons of quitting (SD) 3.5 (0.7) 3.3 (0.7) p < .001

a Socioeconomic status was measured as the highest completed education.

b Hardcore smokers had smoked > 15 years by definition.

c Higher scores indicate more quitting self-efficacy.