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 in Round 1	−1.06	1.15
Weight-for-age z score in Round 1	−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 Coastala	0.10	0.30
Mekong Delta	0.20	0.40

^aHalf of Mekong Delta, with significance differences in parental education and services.

Sources: Young Lives, 2002, 2006 and 2009.