Table 1. Descriptive features of 63 studies in the sample.
| Feature (reliability) | Values (%) |
|---|---|
| Year of publication (r = .95) | |
| Mean | 2012 |
| Median | 2012 |
| SD | 2.53 |
| Country (κ = .92) | |
| United States | 31 (49.2) |
| Spain | 5 (7.9) |
| South Africa | 5 (7.9) |
| China | 3 (4.8) |
| Cuba | 3 (4.8) |
| United Kingdom | 2 (3.2) |
| Mexico | 1 (1.6) |
| Uganda | 1 (1.6) |
| Trinidad and Tobago | 1 (1.6) |
| Thailand | 1 (1.6) |
| Liberia | 1 (1.6) |
| Nigeria | 1 (1.6) |
| Panamá | 1 (1.6) |
| India | 1 (1.6) |
| Colombia | 1 (1.6) |
| Canada | 1 (1.6) |
| Bahamas | 1 (1.6) |
| South Korea | 1 (1.6) |
| Puerto Rico | 1 (1.6) |
| Human Development Index | |
| Very high | 40 (63.5) |
| High | 12 (19) |
| Medium | 6 (9.5) |
| Low | 5 (7.9) |
| Intervention time (κ = 1) | |
| Less than 4h | 7 (14.6) |
| 4h or more | 41 (85.4) |
| Design | |
| Randomized control trials | 25 (39.7) |
| Cluster-randomized control trial | 20 (31.7) |
| Non-randomized control trial | 18 (28.6) |
| Intervention based on theories (κ = .90) | 45 (71.4) |
| Methodology (κ = 1) | |
| Passive | 4 (7.3) |
| Interactive | 51 (92.7) |
| Assessments (in months) | |
| Short-term | |
| Mean (SD) | 1.03 (1.81) |
| Range | 0–6 |
| Medium-term | |
| Mean (SD) | 12.70 (1.99) |
| Range | 12–18 |
| Long-term | |
| Mean (SD) | 29.50 (7.54) |
| Range | 24–40 |
| Goals of the intervention | |
| HIV | 54 (88.5) |
| STIs | 36 (72) |
| Pregnancy | 34 (79.1) |
| Sexual health promotion | 43 (84.3) |
| Intervention included | |
| HIV prevention | 54 (94.7) |
| STIs prevention | 35 (77.8) |
| Pregnancy prevention | 32 (80) |
| Male condom | 41 (87.2) |
| Female condom | 3 (10) |
| Sexual abstinence | 28 (44.4) |
| Transmission routes | 31 (83.8) |
| STIs effects | 21 (65.6) |
| People living with VIH | 13 (52) |
| Drugs prevention | 8 (26.7) |
| Social skills training | 16 (53.3) |
| Auto-instructions | 10 (35.7) |
| Emotional management | 10 (33.3) |
| Self-esteem | 9 (29) |
| Parents’ participation (κ = 1) | |
| No | 54 (85.7) |
| Yes | 9 (14.3) |
| School as setting of implementation | 55 (94.8) |
| Participant characteristics (k = 63) | |
| N at posttest (r = .94) | |
| Total | 38,880 |
| Mean | 1087.69 |
| Median | 784 |
| SD | 1314.41 |
| % females (r = .98) | 58.26 |
| % sexually active | 39.37 |
| Average age (r = 1) | |
| Mean | 14.96 |
| Median | 15.01 |
| SD | 1.37 |
k = number of studies; SD = Standard Deviation. Methodology: 1) Passive: When adolescents simply receive instruction through explanatory talks or watching videos, without their participation being pursued; 2) Interactive: Includes strategies to promote the participation of the members of the group (e.g. sharing opinions, dynamic groups, social skills training through role-playing). Emotional management: Refers to the inclusion of strategies for the emotional management (e.g. relaxation, breathing exercises to relax, etc.).