Table 2.

Comparison of demographic and smoking variables across Levels of Physical Dependence.

	Level 0 PD No physical dependence	Level 1 PD Wanting	Level 2 PD Craving	Level 3 PD Needing	p-Value⁎
	N = 27 (14%)	N = 32 (17%)	N = 29 (16%)	N = 99 (53%)
Gender					0.33
Males	85%	75%	72%	68%
Females	15%	25%	28%	32%
Age (years)	15.5 ± 1.3	15.8 ± 1.1	15.7 ± 1.2	15.6 ± 1.2	0.88
Lifetime cigarette consumption					< 0.001
< 10	19%	13%	4%	7%
10–19	23%	6%	11%	3%
20–99	35%	28%	18%	11%
100 or more	23%	53%	67%	79%
Daily cigarette consumption	3.35 ± 5.61	4.06 ± 4.83	7.98 ± 7.26	10.26 ± 8.23	< 0.001
Days smoked in a month	7.2 ± 8.6	12.6 ± 10.9	20.1 ± 11.8	21.8 ± 11.2	< 0.001
Latency to wanting (hours)	–	237 ± 125	88 ± 116	101 ± 123	< 0.001
Latency to craving (hours)	–	–	85 ± 104	97 ± 116	0.68
Latency to needing (hours)	–	–	–	101 ± 117	–

^⁎Testing for difference among the 4 groups of PD (Chi-square or ANOVA test).