| Variable | Boy | Girl | ||||
| 2nd Grade n (%) | 3rd grade n (%) | McNemar Test | 2nd Grade n (%) | 3rd grade n (%) | McNemar Test | |
| Actual Source of Sexual Knowledge | 510 | 475 |
| 488 | 458 |
|
| School | 229 (44.9) | 205 (43.2) | n.s. | 208 (42.6) | 171 (37.3) | n.s. |
| Parents | 19 (3.7) | 18 (3.8) | n.s. | 29 (5.9) | 34 (7.4) | n.s. |
| Brother/Sister | 17 (3.3) | 12 (2.5) | n.s. | 9 (1.8) | 14 (3.1) | n.s. |
| Friends | 138 (27.1) | 122 (25.7) | n.s. | 93 (19.1) | 87 (19.0) | n.s. |
| TV and Magazines | 39 (7.6) | 45 (9.5) | n.s. | 38 (7.8) | 30 (6.6) | n.s. |
| Internet | 121 (23.7) | 112 (23.6) | n.s. | 58 (11.9) | 61 (13.3) | n.s. |
| Others | 13 (2.5) | 5 (1.1) | n.s. | 10 (2.0) | 4 (0.9) | n.s. |
| Ideal Source of Sexual Knowledge | 510 | 475 |
| 488 | 458 |
|
| School | 235 (46.1) | 252 (53.1) | n.s. | 243 (49.8) | 266 (58.1) | n.s. |
| Parents | 50 (9.8) | 55 (11.6) | n.s. | 94 (19.3) | 74 (16.2) | n.s. |
| Brother/Sister | 20 (3.9) | 21 (4.4) | n.s. | 8 (1.6) | 11 (2.4) | n.s. |
| Friends | 99 (19.4) | 92 (19.4) | n.s. | 78 (16.0) | 59 (12.9) | n.s. |
| TV and Magazines | 65 (12.7) | 55 (11.6) | n.s. | 41 (8.4) | 33 (7.2) | n.s. |
| Internet | 134 (26.3) | 113 (23.8) | n.s. | 71 (14.5) | 56 (12.2) | n.s. |
| Others | 16 (3.1) | 9 (1.9) | n.s. | 9 (1.8) | 9 (2.0) | n.s. |