Here are the models:
xi: svy: logit ta_2 sexenft agenft agenftsq i.imc i.nivvie i.jumellitr i.tailmerc i.anemie i.persassi ptz ptzsq intervpr i.diarrhee i.instrmer i.ethnier i.religion i.anje2 i.grosnair, or
xi: svy: logit ta_2 agenft agenftsq i.imc i.nivvie i.jumellitr i.tailmerc i.anemie i.persassi ptz ptzsq intervpr i.diarrhee i.instrmer i.ethnier i.religion i.anje2 i.grosnair if sexenft==1, or
xi: svy: logit ta_2 agenft agenftsq i.imc i.nivvie i.jumellitr i.tailmerc i.anemie i.persassi ptz ptzsq intervpr i.diarrhee i.instrmer i.ethnier i.religion i.anje2 i.grosnair if sexenft==2, or
The variable sexenft represents the sex of the child and the ta_2 the malnutrition status in two items. As I said, in the first model concerning all children, poverty variable (nivvie) is significant, but in the last two ones (for respectively males and females) , it is not significant. Could it be a matter of low number of cases and how can I explain this?