Table 1. Descriptive Statistics.
| Measure | Min. | Max. | M | SD | % | % missing |
| LANG_B | 13.89 | 69.56 | 44.42 | 10.36 | 4.3 | |
| MATH_B | 16.27 | 61.44 | 43.22 | 9.57 | 5.1 | |
| LANG_E | 17.52 | 71.80 | 52.06 | 9.31 | 4. 5 | |
| MATH_E | 25.54 | 67.98 | 51.56 | 8.88 | 5.1 | |
| EDU_MO | 1 | 7 | 4.44 | 1.77 | 11.6 | |
| EDU_FA | 1 | 7 | 4.47 | 1.65 | 12.9 | |
| OCC_MO | 1 | 5 | 3.24 | 1.02 | 11.6 | |
| OCC_FA | 1 | 5 | 3.28 | 1.05 | 15.6 | |
| INCOME | 1 | 6 | 3.01 | 1.14 | 26.3 | |
| GIFTED | 1 | 6 | 2.35 | 1.24 | 5.1 | |
| FU_CARE | 1 | 6 | 3.93 | 1.55 | 4.3 | |
| HIGH_EDU | 1 | 4 | 2.78 | 0.91 | 10.3 | |
| REL_ACH | 1 | 3 | 2.24 | 0.77 | 6.1 | |
| GENDER (boy) | 50.80 | 0.03 | ||||
| ETHNICITY (minority) | 19.80 | 14.2 |
Note. LANG_B = language achievement at the beginning of the school year; MATH_B = math achievement at the beginning of the school year; EDU_MO = education of the mother; EDU_FA = education of the father; OCC_MO = occupation of the mother; OCC_FA = occupation of the father; FU_CARE = future care; HIGH_EDU = higher education; REL_ACH = relative achievement; LANG_E = language achievement at the end of the school year; MATH_E = math achievement at the end of the school year.