Table 1.

Differences in Dependence Between Daily Smokers (DS) and Intermittent Smokers (ITS) and Also Within ITS

Variable	M (SD)	Range	OR (95% CI)	Receiver operating characteristic curve
FTND
DS	5.15 (1.82)	0–10	2.69 (2.29–3.24)***	0.93
ITS	1.42 (1.60)	0–7	ref	–
CITS	1.69 (1.78)	0–7	1.42 (1.15–1.79)***	0.60
NITS	0.87 (1.14)	0–4	ref	–
TTFC
DS	0.33 (0.51)	0.01–3.33	0.21 (0.13–0.30)***	0.88
ITS	3.86 (4.40)	0–20	ref	–
CITS	3.55 (4.53)	0–20	0.97 (0.91–1.03)	0.60
NITS	4.60 (4.28)	0–14	ref	–
NDSS-T
DS	−0.44(1.00)	−2.71–+1.94	11.07 (7.29–17.85)***	0.93
ITS	−2.04(0.60)	−3.07–+1.54	ref	–
CITS	−1.92(0.70)	−3.07–+1.54	2.42 (1.41–4.38)***	0.61
NITS	−2.21(0.44)	−2.96–−1.18	ref	–
WISDM primary
DS	4.49 (1.19)	1.59–6.90	4.18 (3.32–5.42)***	0.92
ITS	2.31 (1.10)	1–6.50	ref	–
CITS	2.56 (1.21)	1–6.50	1.93 (1.40–2.79)***	0.66
NITS	1.91 (0.78)	1–4.38	ref	–
WISDM secondary
DS	4.00 (1.06)	1.18–6.78	3.69 (2.88–4.85)***	0.83
ITS	2.75 (0.90)	1.07–6.00	ref	–
CITS	2.90 (0.98)	1.07–6.00	1.63 (1.17–2.34)**	0.61
NITS	2.50 (0.76)	1.17–4.66	ref	–
HONC continuous
DS	7.36 (2.19)	1–10	1.65 (1.48–1.87)***	0.81
ITS	4.63 (2.70)	0–10	ref	–
CITS	5.30 (2.66)	0–10	1.33 (1.16–1.55)***	0.70
NITS	3.38 (2.39)	0–8	ref	–
HONC dichotomous
DS	10 (0.00)	10–10	p < .001a	0.54
ITS	9.32 (2.50)	0–10	ref	–
CITS	9.70 (1.71)	0–10	1.18 (1.04-1.38) *	0.56
NITS	8.68 (3.42)	0–10	ref	–

Note. All models weighted by race. Daily smokers (DS) versus intermittent smokers (ITS) comparisons controlled for history of daily smoking (converted ITS [CITS] vs. native ITS [NITS]) among ITS. M = mean; FTND = Fagerström Test for Nicotine Dependence; TTFC = time to first cigarette (hr); NDSS = Nicotine Dependence Syndrome Scale; WISDM = Wisconsin Inventory of Smoking Dependence Motives; HONC = Hooked on Nicotine Checklist; ref = reference group.

*p < .05. **p < .01. ***p < .001.

^aAn OR could not be computed, because all DS were classified as dependent.