Table 3.

Test of proportions among indicators of dependence. Z statistics and associated p-values.

First Use within 30 min		Z	p
Cigarettes	snus	−1.73	0.084
	NR	1.35	0.177
	Coffee	5.92	<0.000 *
snus	NR	1.64	0.101
	Coffee	8.07	<0.000 *
NR	Coffee	1.84	0.066
First use the most important of all
Cigarettes	snus	1.04	0.298
	NR	1.85	0.064
	Coffee	−0.78	0.435
snus	NR	1.50	0.134
	Coffee	-4.16	<0.000 *
NR	Coffee	−3.04	0.002 *
Would be very hard to give up
Cigarettes	snus	0.86	0.390
	NR	1.70	0.089
	Coffee	5.92	<0.000 *
snus	NR	1.74	0.082
	Coffee	6.21	<0.000 *
NR	Coffee	0.38	0.704

* p < 0.003, NR: nicotine replacement.