Socioeconomic Differences in Tobacco Smoking in Italy: Is There an Interaction between Variables?

Table 4

Synergistic interaction between Sociodemographic variables in influencing ever and current smoking.

Variables		Ever smokers AOR (95% CI)*	Synergistic interaction	Current smokers AOR (95% CI)*	Synergistic interaction
No university degree	Divorced
No	No (reference)	1		1
Yes	No	1.08	1.96	1.08	1.67
No	Yes	1.44		1.44
Yes	Yes	2.02		2.02
No university degree	Males
No	No (reference)	1		1
Yes	No	0.75	−0.88	0.75	−1.33
No	Yes	0.65		0.65
Yes	Yes	1.53		1.53
No university degree	Low income
No	No (reference)	1		1
Yes	No	1.41	0.5	1.24	0.62
No	Yes	1.13		1.21
Yes	Yes	1.27		1.28
Males	North-Centre
No	No (reference)	1		1
Yes	No	1.41	0.24	1.03	−0.06
No	Yes	1.44		1.44
Yes	Yes	1.27		0.97
Males	Divorced
No	No (reference)	1		1
Yes	No	0.74	0.36	0.56	0.82
No	Yes	2.23		2.41
Yes	Yes	1.35		1.80
Females	Divorced
No	No (reference)	1		1
Yes	No	0.45	−1.52	0.42	−1.38
No	Yes	0.74		0.56
Yes	Yes	2.23		2.41
Males	Low income
No	No (reference)	1		1
Yes	No	0.58	−1.07	0.96	2.00
No	Yes	0.74		1.06
Yes	Yes	1.73		1.04

*AOR: odds ratio adjusted for age and gender.