| Variable | Boy | Girl | ||||
| 2nd Grade n (%) | 3rd grade n (%) | McNemar Test | 2nd Grade n (%) | 3rd grade n (%) | McNemar Test | |
| Have ever received sex education? | 504 | 473 | n.s. | 482 | 456 | n.s. |
| Yes | 338 (67.1) | 326 (68.9) | 356 (73.9) | 316 (69.3) | ||
| No | 166 (32.9) | 147 (31.1) | 126 (26.1) | 140 (30.7) | ||
| Do you have a sufficient sexual knowledge? | 490 | 473 | n.s. | 473 | 453 | n.s. |
| Yes | 258 (52.7) | 233 (49.3) | 216 (45.7) | 181 (40.0) | ||
| No | 232 (47.3) | 240 (50.7) | 257 (54.3) | 272 (60.0) | ||