Table 1. Descriptive statistics of variables.
| Variables | Mean | Std. Dev. |
|---|---|---|
|
| ||
| Birth weight (kg) | 3.10 | 0.45 |
| Birth weight greater than 3.5 kg | 0.12 | 0.32 |
| Missing birth weight | 0.11 | 0.32 |
| If boy | 0.51 | 0.50 |
| Born in 2002 | 0.19 | 0.40 |
| Height-for-age z score at age 1 year (HAZ1) | -1.06 | 1.15 |
| Weight-for-age z score at age 1 year (WAZ1) | -0.93 | 1.02 |
| Height-for-age z score at age 8 years (HAZ8) | -1.06 | 1.01 |
| Weight-for-age z score at age 8 years (WAZ8) | -1.12 | 1.26 |
| EGRA (proportion correct) | 0.50 | 0.12 |
| Math (proportion correct) | 0.68 | 0.20 |
| Receptive Vocabulary (proportion correct) | 0.47 | 0.14 |
| If mother's first child | 0.46 | 0.50 |
| Mother's height (cm) | 152.4 | 5.65 |
| Mother's BMI | 21.06 | 2.68 |
| Mother is ethnic minority | 0.12 | 0.32 |
| Mother completed lower secondary school | 0.36 | 0.48 |
| Father completed lower secondary school | 0.45 | 0.50 |
| Wealth index in Round 1 | 0.44 | 0.21 |
| Urban | 0.20 | 0.40 |
| Mountainous | 0.23 | 0.42 |
| Red River Delta | 0.21 | 0.41 |
| Mekong Coastal* | 0.10 | 0.30 |
| Mekong Delta | 0.20 | 0.40 |
*
Half of Mekong Delta, with significance differences in parental education and services
Sources: Young Lives, 2002, 2006 and 2009