Schema of population dynamics of the mathematical model.

<p>Each box represents a population subgroup, i.e. compartment. The arrows indicate how the population in each compartment could move from one compartment to another via our mathematical model. The variable names are found in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0170485#pone.0170485.t002" target="_blank">Table 2</a> and the mathematical equations on the arrows can be found in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0170485#pone.0170485.s001" target="_blank">S1 Material</a>. For example, <i>b</i>_<i>K</i> <i>U</i> means newborn boys or girls from married coupled and hence they are moved to the children compartments <i>G</i>_<i>M</i> or <i>G</i>_<i>F</i>.