Table 1. Sociodemographic and sexual characteristics of male adolescents who have sex with men (n=578). Brazil, Portugal, 2021.

Variables	n	%	*95%CI
Age
18	303	52.4	48.3-56.6
19	275	47.6	43.4-51.7
Sex assigned at birth (n=577)
Male	557	96.5	94.7-97.9
Female	20	3.5	2.1-5.3
Education
Primary	8	1.4	0.6-2.7
Secondary	217	37.5	33.6-41.6
Attending tertiary	353	61.1	57.0-65.1
Country of birth
Brazil	367	63.5	59.4-67.4
Portugal	202	34.9	31.1-39.0
Mozambique	4	0.7	0.2-1.8
Guinea Bissau	4	0.7	0.2-1.8
Cape Verde	1	0.2	0.004-0.10
Country of residence
Brazil	291	50.3	46.2-54.5
Portugal	287	49.7	45.5-53.8
Relationship status
Single	401	69.4	65.4-73.1
Steady relationship	149	25.8	22.2-29.5
Polyamorous relationship	28	4.8	3.2-6.9
Sexual partner
Casual/occasional partner	403	69.7	65.8-73.4
Steady/usual partner	28	4.8	3.2-6.9
Steady partner and occasional partners	147	25.4	21.9-29.2
Number of partners in the last 30 days
None	97	16.8	13.8-20.1
1 to 2	309	53.5	49.3-57.6
3 or more	172	29.8	26.1-33.7
Sexual position of preference
Oral sex only	21	3.6	2.26-5.50
Penetrating/top - exclusively	51	8.8	66-11.4
Penetrating/top - mostly	101	17.5	14.5-20.8
Being penetrated/bottom - exclusively	68	11.8	9.3-14.7
Being penetrated/bottom - mostly	111	19.2	16.1-22.7
Penetrating and being penetrated (versatile) alike	226	39.1	35.1-43.2
Chemsex practice
No	400	69.2	65.3-72.9
Yes	178	30.8	27.1-34.7
Use of apps† †
No	104	18.0	14.9-21.4
Yes	474	82.0	78.6-85.1
Sexual partners found through apps
No	108	18.7	15.6-22.1
Yes	470	81.3	77.9-84.4

*95%CI = 95% Confidence Interval; ^†Apps = Dating apps