Table 1. Descriptive information of included studies (n = 9).
| Reference | Research location (year of data collection) | Sampling | Sample (% of females) | Age group |
|---|---|---|---|---|
| Bento et al. 18 | Bauru (SP); 2017 | R | 1,628 (nd) | 14–18 |
| De Vitta et al. 19 | Bauru (SP); 2007 | AE | 1,236 (52) | 11–14 |
| Fernandes et al. 20 | Ourinhos (SP); 2009 | AE | 1,461 (48) | 10–14 |
| França et al. 21 | Itaquaquecetuba and Mogi das Cruzes (SP); 2017 | C | 577 (48) | 10–16 |
| Meucci et al. 22 | Caracol (PI); 2010 | AT | 1,112 (53) | 13–19 |
| Onofrio et al. 23 | Pelotas (RS); 2009 | R | 1,280 (54) | 13–19 |
| Schwertner et al. 24 | Florianópolis (SC); NR | C | 330 (74) | 15–18 |
| Silva et al. 25 | Recife (PE); 2012 | R | 961 (59) | 14–19 |
| Zapata et al. 26 | São Paulo (SP); NR | C | 791 (52) | 14–17 |
R: sampling by randomized process; AE: all enrolled in municipal public schools; C: convenience sample; AT: all teenagers in the city; NR: not reported; nd: not described.