Table 2. Lifetime prevalence of MDQ positivity in Sardinian immigrants vs. residents of Sardinia and of six different regions of Italy (AIFA study database).

Age, gender	Sardinian immigrants	Sardinians in Sardinia	Italians	Comparison vs. Sardinians	Comparison vs. Italians
≤ 40, male	1 (8.3)	1 (2.2)	25 (3.7)	χ2 with Yates correction = 1.04, p = 0.316; OR = 4.00 95%CI 0.10-162.24	χ2 with Yates correction = 0.004, p = 0.952; OR = 2,33 95%CI 0.11-18.69
≤ 40, female	4 (12.5)	3 (4.2)	28 (3.4)	χ2 with Yates correction = 1.30, p = 0.254; OR = 3.28 95%CI 0.57-20.09	χ2 with Yates correction = 4.656, p = 0.031; OR = 4.00 95%CI 1.1-13.1
> 40, male	8 (6.0)	2 (1.9)	24 (3.1)	χ2 = 2.33, p = 0.126; OR = 3.10 95%CI 0.61-22.38	χ2 = 2.73, p = 0.098; OR = 1.97 95%CI 0.79-4.75
> 40, female	9 (7.2)	3 (3.3)	26 (2.3)	χ2 = 1.32, p = 0.256; OR = 2.15 95%CI 0.51-0.34	χ2 = 9.67, p = 0.002; OR = 3.24 95%CI 1.37-7.44
Male	9 (6.1)	49 (3.4)	3 (2.0)	χ2 = 2.08, p = 0.09; OR = 1.86 95%CI 0.83-0.404	χ2 = 3.28, p = 0.007; OR = 3.17 95%CI 0.87-15.01
Female	13 (8.0)	8 (4.9)	54 (2.7)	χ2 = 1.27, p = 0.267; OR = 1.68 95%CI 0.52-4.58	χ2 = 14.35, p < 0.001; OR = 3.17 95%CI 1.60-6.14
≤ 40	5 (11.4)	4 (3.5)	53 (3.5)	χ2 = 1.32, p = 0.255; OR = 2.15 95%CI 0.51-0.34	χ2 = 3.90, p = 0.048; OR = 3.61 95%CI 1.0-15.1
> 40	17 (6.5)	50 (2.6)	5 (2.6)	χ2 = 18.65, p = 0.001; OR = 2.59 95%CI 1.71-4.70	χ2 = 7.49, p = 0.008; OR = 3.45 95%CI 1.14-9.63
Total	22 (7.2)	9 (2.9)	103 (3.0)	χ2 = 5.97, 1 df; p = 0.015; OR = 2.47 95%CI 1.49-4.06	χ2 = 14.79, 1 DF; p < 0.001; OR = 2.32 95%CI 1.39-5.38
Total after direct standardization by sex and age	25.9 (8.5)	-	103 (3.0)	-	χ2 = 25.53, 1DF; p < 0.001; OR = 2.95 95%CI 1.83-4.70
Total after direct standardization by sex and age	26.3 (8.6)	9 (2.9)	-	χ2 = 26.65, 1 df; p < 0.001; OR = 3.0 95%CI 1.87-4.77	-

Data presented as n (%).

95%CI = 95% confidence interval; df = degree of freedom; MDQ = Mood Disorder Questionnaire; OR = odds ratio.