Table 3.

Main predictors of the use of E-mail

	Use of E-mail
	Low frequency of use			Mid/high frequency of use
	OR1	(95% CI)	P -value	OR2	(95% CI)	P -value
CRUDE OR
Gender
Male	1.00		<0.001	1.00		0.169
Female	0.65	(0.53-0.81)		0.822	(0.62-1.09)
Social class
Disadventaged-M	1.00		<0.001	1.00		<0.001
Most favored_NM	1.93	(1.37-2.72)		6.48	(5.02-8.37)
Educational level
<Secondary	1.00		<0.001	1.00		<0.001
≥Secondary	2.56	(1.89-3.46)		6.97	(5.52-8.81)
Age Group
>65	1.00			1.00
46-65	4.95	(2.24-10.94)	<0.001	5.16	(3.03-8.80)	<0.001
36-45	12.4	(5.45-28.51)	<0.001	19.36	(11.07-34.06)	<0.001
18-35	34.0	(14.59-79.40)	<0.001	51.86	(28.39-94.71)	<0.001
Fagerström test
High	1.00			1.00
Medium	1.46	(0.87-2.46)	0.152	2.33	(1.55-3.51)	<0.001
Low	1.47	(0.88-2.45)	0.144	2.74	(1.83-4.09)	<0.001
ADJUSTED OR*
Gender
Male	1.00		0.613	1.00		0.300
Female	0.926	(0.66-1.27)		0.86	(0.65-1.14)
Social class
Disadventaged-M	1.00		0.019	1.00		<0.001
Most favored_NM	1.61	(1.08-2.34)		4.293	(3.11-5.93)
Educational level
<Secondary	1.00		<0.001	1.00		<0.001
≥Secondary	2.22	(1.56-3.15)		4.08	(3.03-5.48)
Age Group
>65	1.00			1.00
46-65	4.64	(2.06-10.45)	<0.001	5.46	(2.97-10.04)	<0.001
36-45	11.9	(5.10-28.11)	<0.001	21.9	(11.4-41.9)	<0.001
18-35	33.4	(13.97-80.25)	<0.001	60.0	(30.1-95.3)	<0.001
Fagerström test
High	1.00			1.00
Medium	1.25	(0.71-2.19)	0.436	1.92	(1.15-3.20)	0.013
Low	1.24	(0.71-2.17)	0.448	2.03	(1.22-3.38)	0.006

M = Manual; NM = Non Manual.

Low frequency of use: ≤1 time per week; Mid/high frequency of use: >1 time per week.

OR: Odd Ratio; OR = 1 denotes reference category.

OR1: Odds Ratio of low frequency use vs. no use.

OR2: Odds Ratio of mid/high frequency use vs. no use.

Adjusted OR*: OR adjusted for potential confounders: in the case of gender by age, social class and level of education. Fagerström test was adjusted for all other variables.

P-value derived from the Wald test.