| N (%) | |
| Gender | |
| Boys | 1375 (51.1) |
| Girls | 1316 (48.9) |
| Nationality | |
| Greek | 2319 (89.8) |
| Other | 263 (10.2) |
| Grade | |
| First | 1344 (49.9) |
| Second | 1347(50.1) |
| Comprehension of Greek | |
| None to moderate | 59 (21.2) |
| Very good | 125 (45.0) |
| Excellent | 94 (33.8) |
| Speaking Greek | |
| None to moderate | 80 (28.8) |
| Very good | 122 (43.9) |
| Excellent | 76 (27.3) |
| Father’s educational level | |
| Primary to middle school | 236 (13.2) |
| High school | 540 (30.3) |
| 2-year college/University/Post-graduate studies | 1008 (56.5) |
| Mother’s educational level | |
| Primary to middle school | 155 (8.6) |
| High school | 520 (28.7) |
| 2-year college/University/Post-graduate studies | 1137 (62.7) |
| Parents living together | |
| No | 267 (11.2) |
| Yes | 2119 (88.8) |
| Number of siblings | |
| None | 291 (12.6) |
| One | 1217 (52.7) |
| Two or more | 802 (34.7) |
| Attendance of all-day school schedule | |
| No | 1842 (69.1) |
| Yes | 823 (30.9) |
| Attendance of an Integration Class | |
| No | 2562 (96.5) |
| Yes | 93 (3.5) |
| Receiving Parallel Support | |
| No | 2627 (99.2) |
| Yes | 20 (0.8) |
| Re-attendance of the same grade | |
| No | 2604 (98.1) |
| Yes | 50 (1.9) |
| Number of students in class, mean (SD) | 21.6 (3.3) |