Table 1:

Descriptive statistics of intitial and analytic sample

	Initial Sample (All second births)		Final sample (second births born to women who had not used contraception or spaced births, and interviewed within 12 months after birth)
	Mean	SE	Mean	SE
Sex of second birth	0.511	0.500	0.512	0.500
Second birth interval (in months)	36.681	33.006	38.601	23.298
Death of first birth (within 1st year)	0.118	0.323	0.109	0.311
Mother’s education
No education	0.354	0.478	0.505	0.500
Primary	0.325	0.469	0.306	0.461
Secondary plus	0.321	0.467	0.189	0.392
Mother’s wealth quintile
Poorest	0.183	0.387	0.241	0.428
Poorer	0.185	0.388	0.225	0.418
Middle	0.192	0.394	0.203	0.402
Richer	0.205	0.404	0.184	0.387
Richest	0.235	0.424	0.147	0.354
Mother’s religion
Muslim	0.306	0.461	0.442	0.497
Catholic	0.206	0.405	0.184	0.388
Protestant	0.184	0.387	0.126	0.331
Other Christian	0.238	0.426	0.169	0.375
Other	0.032	0.176	0.035	0.183
No religion	0.034	0.181	0.044	0.205
Urban	0.345	0.476	0.274	0.446
Age	28.498	9.462	23.314	4.222
Age at 2nd birth	22.146	4.067	22.978	4.184
Mother’s marital status
Monogamous	0.431	0.495	0.598	0.490
Polygamous marriage	0.168	0.374	0.192	0.394
Non marital union	0.076	0.266	0.114	0.318
Not in a union	0.325	0.468	0.096	0.295
Duration of union (in months)	157.981	106.641	62.438	33.637
Sex of first birth	0.514	0.500	0.513	0.500
Mother’s ideal proportion of sons:
None	0.150	0.357	0.157	0.364
Less than 1/2	0.158	0.365	0.154	0.361
1/2	0.431	0.495	0.418	0.493
More than 1/2	0.180	0.384	0.201	0.401
More than 3/4	0.017	0.128	0.017	0.129
Non-numeric response	0.065	0.246	0.052	0.223
Mother’s total children ever born	2.961	2.830
Mother’s ever use of contraception	0.368	0.482
Total N	281,221		4,470