	Model 1		Model 2		Model 3
	Coeff.	t-stat	Coeff.	t-stat	Coeff.	t-stat
Characteristics of children
Child’s age in months	−0.0603463	−10.02^***	−0.0602642	−10.01^***	−0.0603277	−100.01^***
Square of the child’s age in months	0.0006875	6.80^***	0.0006859	6.79^***	0.000689	6.81^***
Child’s gender	−0.1347898	−2.56^**	−0.1355429	−2.57^**	−0.1314197	−2.49^**
Child’s birth rank	−0.0169985	−0.25	−0.0165796	−0.24	−0.013153	−0.19
Interval in months separating the child considered from the next oldest child	0.004184	3.72^***	0.0041986	3.73^***	0.0041768	3.70^***
The presence of a twin	−0.8650292	−5.23^***	−0.8665762	−5.23^***	−0.8491915	−5.12^***
The number of children in the household	0.0004628	0.03	0.0004461	0.03	−0.0003524	−0.02
The number of children under age 5 in the household	−0.0328394	−0.65	−0.0324841	−0.65	−0.0315158	−0.63
Characteristics of the household
Mother’s education (years of studies)	0.0361313	3.98^***	0.0344436	3.63^***	0.0362409	3.99^***
The wife has access to at least one media	0.033885	0.45			0.0174828	0.23
The wife knows how to read			−0.0258781	−0.35
The mother’s age at the first birth	0.0131173	1.09	0.013266	1.11	0.0136326	1.13
The mother’s age (at the time of the birth)	0.0030219	0.31	0.0027995	0.29	0.0030985	0.32
The mother’s health status (body mass index)	−0.0043082	−2.53^**	−0.0043145	−2.54^**	−0.0041726	−2.46^**
Family situation (single parent family)	−0.0545196	−0.75	−0.0547773	−0.75	−0.0486887	−0.67
Family situation (polygamous family)	−0.0924776	−1.15	−0.0918426	−1.14	−0.0917358	−1.13
Wealth index (household income)	0.4357158	2.86^***	0.4432275	2.91^***
Socio-economic classification
Poorest					−0.2930593	−2.19^**
Poor					−0.1416679	−1.12
Average					−0.1607942	−1.26
Rich					0.0144374	0.12
Characteristics of environment/community
The household has access to drinking water	−0.0776559	−1.05	−0.0768514	−1.04	−0.070348	−0.95
The household has electricity	−0.0828471	−1.06	−0.0813175	−1.05	−0.0594063	−0.76
Type of toilet in the household	0.1608071	2.10^**	0.161577	2.10^**	0.1723039	2.26^**
Type of floor in the household	0.0404869	0.54	0.0394338	0.53	0.0284875	0.38
- Place of residence
Rural	−0.269182	−2.88^***	−0.2713925	−2.91^***	−0.2618085	−2.81^***
- Region of residence
Brazzaville	−0.1898967	−2.33^**	−0.188974	−2.32^**	−0.2012345	−2.47^**
South	0.2215025	2.17^**	0.2223461	2.17^**	0.2082142	0.04^**
North	0.1044212	0.97	0.1065899	0.99	0.0796651	0.74
Constant	−0.0858426	−0.29	−0.0380752	−0.13	0.0489823	0.15
	N = 3824		N = 3824		N = 3824
	F(24, 3799) = 17.48		F(24, 3799) = 17.45		F(27, 3796) = 15.61
	R² = 0.0948		R² = 0.0949		R² = 0.0953