| Chi-square | P | Late (NO. %) | NORMAL (NO. %) | Early (NO. %) | Characteristics |
| Father’s occupation | |||||
| 1.005 | 0.909 | 14% - 0.9% 18% - 1.2% 6% - 2.0% | 205% - 13.8% 341% - 23.0% 133% - 9.0% | 233% - 15.7% 379% - 25.5% 155% - 10.4% | High income Middle income Low income |
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| Mother’s occupation |
| 21.317 | 0.001 | 6% - 0.4% 11% - 0.7% 21% - 1.4% | 18% - 1.2% 236% - 15.9% 427% - 28.7% | 22% - 1.5% 275% - 18.5% 470% - 31.6% | High income Middle income Low income |
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| Father’s education |
| 16.596 | 0.084 | 4% - 0.3% 4% - 0.3% 6% - 0.4% 15% - 1.0% 5% - 0.3% 4% - 0.3% | 32 - 2.2% 131% - 8.8% 190% - 12.8% 232% - 15.6% 55% - 3.7% 41% - 2.8% | 52% - 3.5% 112% - 7.5% 205% - 13.8% 285% - 19.2% 74% - 5.0% 39% - 2.6% | Uneducated Preparatory Secondary Universal Master Doctorate |
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| Mother’s education |
| 46.544 | 0.001 | 7% - 0.5% 5% - 0.3 % 9% - 0.6% 8 - 0.5% 61 - 4.1% 31 - 2.1% | 94% - 6.3% 132% - 8.9% 136% - 9.2% 273 - 18.4% 34 - 2.3% 12 - 0.8% | 101% - 6.8% 135% - 9.1% 165% - 11.1% 329 - 22.1% 24 - 3.1% 13 - 1.7% | Uneducated Preparatory Secondary Universal Master Doctorate |
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| Housing type | ||
| 6.912 | 0.032 | 27% - 1.8% 11% - 0.7% | 553% - 37.2% 128% - 8.6% | 583% - 39.2% 184% - 12.4% | Property Rent |