Variable Mean SD 95% CI
Constant 1.101 0.083 (0.913, 1.260)
Region      
North Central (ref.) 0
North East 0.001 0.024 (-0.046, 0.050)
North West -0.019 0.025 (-0.074, 0.029)
South East 0.045 0.027 (-0.004, 0.100)
South West -0.004 0.026 (-0.054, 0.050)
South South 0.024 0.022 (-0.016, 0.070)
Place of Residence      
Rural (ref.) 0
Urban 0.013 0.005 (0.003, 0.023)*
Mother’s Educational Attainment      
No education (ref.) 0
Primary 0.085 0.006 ( 0.072, 0.097)*
Secondary -0.076 0.007 (-0.090, -0.063)**
Higher -0.123 0.013 (-0.148, -0.097)**
Ethnicity      
Other ethnic groups (ref.) 0
Yoruba -0.039 0.014 (-0.065, -0.011)**
Ibo 0.012 0.017 (-0.023, 0.043)
Hausa 0.017 0.011 (-0.005, 0.038)
Wealth Index      
Poorest/Poorer (ref.) 0
Middle Class 0.006 0.005 (-0.004, 0.016)
Richer/Richest -0.009 0.007 (-0.023, 0.004)
Religion      
None/Traditional (ref.) 0
Christianity -0.031 0.01 (-0.051, -0.012)**
Islam -0.013 0.011 (-0.034, 0.007)
Family Planning      
No method (ref.) 0
Folkloric/Traditional/Modern -0.04 0.004 (-0.048, -0.031)**
Marital Status      
Other (ref.) 0  
Married and living with partner 0.091 0.008 ( 0.076, 0.106)*
Partner’s Education      
No education (ref.) 0  
Primary 0.002 0.006 (-0.009, 0.013)
Secondary -0.048 0.006 (-0.059,-0.037)**
Higher 0.001 0.008 (-0.013, 0.017)
Mother’s Working Status  
Not Working (ref.) 0
Working 0.058 0.003 ( 0.052, 0.064)*
Mode of Delivery      
Normal delivery (ref.) 0
Caesarean section -0.049 0.012 (-0.072, -0.026)**
Sex of Children      
Boys (ref.) 0
Daughters 0.277 0.003 ( 0.271, 0.283)*
Children Dead      
No (ref.) 0
Yes -0.214 0.003 (-0.219, -0.208)**
The continuous variables      
Age at first birth 0.006 0.005 ( 0.001, 0.019)*
Body mass index 0.001 0.001 ( 0.003, 0.004)*
The spatial variable      
States (36) and FCT 0.003 0.001 ( 0.001, 0.006)*
The Random effect      
Community 0.005 0.001 ( 0.004, 0.006)*
Household 0.001 0.001 ( 0.001, 0.002)*
**Negatively significant
*Positively significant
Table 2: Posterior estimates of M4 within 95% credible interval (CI).