Table 2.

Tests of prevalence differences and degree of agreement for binary variables.

			Phone administered	Internet administered	Phone–Internet difference	McNemar’s Test	Degree of agreement
Variable name	N/n	N_D	Yes (%)	Yes (%)	Yes (%)	p-value	κ	95% CI
Quit methods (ever used)
Cold turkey	213	22	80.28	83.10	−2.82	.2863	.63	(.48–.75)
Pamphlet or booklet	213	21	21.60	23.94	−2.35	.3833	.70	(.56–.79)
Individual counseling	213	9	4.69	4.23	0.47	1.0000	.42	(.17–.67)
Group counseling	213	9	7.51	7.98	−0.47	1.0000	.73	(.51–.86)
Nicotine patch	213	8	53.05	52.11	0.94	.7266	.93	(.86–.96)
Nicotine gum	213	8	37.09	35.21	1.88	.2891	.90	(.82–.95)
Nicotine spray	213	2	0.47	1.41	−0.94	.5000	.50	(.09–.86)
Nicotine lozenge	213	5	10.80	9.39	1.41	.3750	.88	(.72–.95)
Nicotine inhaler	213	6	6.57	6.57	0.00	1.0000	.77	(.54–.89)
Bupropion	213	7	35.21	36.62	−1.41	.4531	.92	(.85–.96)
Switch to chew tobacco/snuff	213	6	8.45	8.45	0.00	1.0000	.81	(.61–.91)
Internet	213	16	6.57	6.57	0.00	1.0000	.39	(.17–.61)
Telephone counseling	213	7	3.76	4.23	−0.47	1.0000	.57	(.28–.79)
Acupuncture	213	1	6.57	7.04	−0.47	1.0000	.96	(.80–.99)
Hypnosis	213	2	15.02	15.96	−0.94	.5000	.95	(.85–.98)
Ever had smoking related illness?	212	32	59.91	49.53	10.38	.0001	.71	(.60–.79)
Do you drink alcohol?	213	8	74.18	74.18	0.00	1.0000	.88	(.79–.94)
Drink more than meant to	154	8	61.69	60.39	1.30	.7266	.86	(.76–.93)
Wanted/needed to cut down	154	8	22.08	20.78	1.30	.7266	.84	(.70–.92)

N_{_D}, Number of discordant pairs.