Table 1.

Participants’ demographics

	Guinea-Bissau (n = 33)	Portugal (n = 32)	Group comparison Guinea-Bissau vs. Portugal
Age (years; mean ± standard deviation)	25.9 ± 5.0	22.7 ± 5.2	t(63) = 2.47, p = .016*
Sex (male/female)	22/11	24/8	χ2(1) = 0.55, p = .460
University education (yes/no)	31/2	30/2	p > .999
Heterosexual (yes/no)	33/0	31/1	p = .492
Handedness (right/left)	32/1	32/0	p > .999
Drug addictiona (yes/no)	0/33	1/31	p = .492
Drug useb (yes/no)	0/33	8/24	p = .002*
Alcohol usec (yes/no)	0/33	6/26	p = .011*
Tobacco used (yes/no)	1/32	1/31	p > .999
Mental health problemse (yes/no)	6/27	3/29	p = .475
Family member with a mental illnessf (yes/no)	6/27	5/27	χ2(1) = 0.08, p = .783

Group comparisons between Guinea–Bissauan and Portuguese were performed with a two-sample t test for age and Chi-square test or the Fisher’s Exact Test (if there are less than 5 cases in one of the tested groups) for all the other variables and marked with an asterisk if significant at a level of p value < .05

^aPersonal history of drug addiction

^bUse of recreational drugs in the last 6 months

^cConsumes more than 28 units of alcohol per week (1 unit = ½ beer or 1 glass of wine)

^dSmokes more than 5 cigarettes per day

^eParticipant had a diagnosed mental illness in the past

^fParticipant had at least one family member with a diagnosed mental illness