Table 1

Observations of all, licit and illicit brand cigarette purchases and proportion of purchases that were illicit

Number of observations	Wave 1 (2005)	Wave 2 (2006–2007)	Wave 3 (2008)	Wave 4 (2009)	Wave 5 (2011–2012)
All brands	1652	1159	1459	1658	1592
Packs	1587	1110	1412	1577	1519
Sticks	65	49	47	81	73
Licit brands	1407	935	1192	1451	1329
Packs	1355	895	1153	1384	1267
Sticks	52	40	39	67	62
Illicit brands	245	224	267	207	263
Packs	232	215	259	193	252
Sticks	13	9	8	14	11
Proportion of purchases that were illicit
All	15.4%	19.7%*	19.8%	13.4%***	16.5%*
Packs	15.3%	19.8%*	19.7%	13.4%***	16.6%*
Sticks	19.4%	16.4%	22.9%	11.9%	12.9%

*p<0.05, **p<0.01, ***p<0.001 indicates the test of comparisons of proportions result. The proportion of purchases that were illicit was tested against the immediately preceding wave.