. 2014 Jan 10;16(6):743–752. doi: 10.1093/ntr/ntt205

Table 2.

Smoking Frequency and Quantity Across the Identified Groups

	# of days smoked per week	# of cigarettes smoked per smoking day
	Mean (SD)	Mean (SD)
Group 1: stable infrequent smokers (42.1%)	0.14 (0.10)	1.63 (1.11)^a
Group 2: increasing infrequent smokers (11.3%)	0.68 (0.31)^a	1.83 (0.70)^a
Group 3: decreasing infrequent smokers (12.0%)	0.70 (0.34)^a	2.06 (1.15)^a
Group 4: occasional smokers (13.9%)	2.36 (0.78)	2.33 (0.95)^a
Group 5: frequent smokers (20.7%)	5.66 (1.42)	6.32 (4.28)

Note. Values with the same superscript do not differ pairwise from each other at p < .05.