The aim of this study was to assess the prevalence and association of under-five child mortality in the pastoralist communities of Ethiopia. The present study reported 23.2%, 95%CI (21.4%, 24.6%) of under-five child mortality in the pastoralist regions, Ethiopia.This current prevalence is similar with the global prevalence of under-five mortality 21.6%(15), and the UN Inter-Agency Groupprevalence of under-five mortality for Latin America and the Caribbean regions, 27.0% (16).The similarity might be as a result of comparable socio-economic status between Ethiopia, and Latin America or the Caribbean regions. The present study’s prevalence of under-five child mortality is also similar with a study that reported a 22.9% of under-five mortality from Afar region (17).The prevalence of the current study is higher than the prevalence of U5M in the west Africa countries that varied from the highest 11.1%in Sierra Leone, Nigeria 10.0%, Mali 10.6%, to the smallest prevalence of mortality in Cape Verde 1.7%(18). The difference might be as result of socio-economic difference. The former studies were a nationwide studies but the current study consider the poorest regions in Ethiopia that might contribute for the highest prevalence of under-five child mortality. The prevalence of under-five mortality in the pastoralist regions arehigher than the 2016 EDHS based studythat reported 6.7%(5). The difference might be as a result of socio-demographic difference between the pastoralist regions and the wider community, Ethiopia. The current study also reported farhigher than the other reports from Afar region that were 12.3% in 2005, and 12.7% in 2011(17).The present study is higher than a study that conducted in Somalia, Benishangul, and Gambella regions (17). The difference might be as a result of study population and data collection methods difference. The former studies were a passive survey among mother-child pair who visited health facility that contradicts with the present active community survey. The current study is lower than the UN Inter-Agency Group report, 31.4% in 2016 at South-Eastern Asia(16). The difference might be as a result of thatthe current study is a proximate prevalence that might be biased because of recall bias, and social desirability bias.
In addition to the above general description, we considered the total prevalence of mortality by gender. In the 2016 EDHS data collection, the total number of children died in the house despite the year that children died were considered. This might create discomfort for mothers who lost many children. Thus, we analyzed the mortality data by sex independently.Accordingly, the prevalence of under-five mortality among daughters was 15.4%, 95%CI (14.2, 16.6%), and among sons was 16.8%, 95%CI (15.6, 18.1%). The current prevalence among sons and daughters were almost similar by consensus but in 95%CI, the mortality among boys was high. However, we discussed the prevalence of under-five mortality in considering the lower confidence interval of daughters, and the upper confidence interval of sons (14.2, 18.1). The separate prevalence among daughters and sons might be more precise than the aggregate prevalence reported despite the sex of children. Accordingly, the current prevalence of U5M is higher than a study conducted in west Africa and that reported 11.1% in Sierra Leone, Nigeria 10.0%, Mali 10.6%, and in Cape Verde 1.7%(18). The difference might be as a result of study population, and socio-economic dissimilarity. The former study considered children despite their sex, however this study’s analysis focus on male or female children from poorest regions of Ethiopia separately. Thepresent study’s prevalence is consistent with a decomposition analysis conducted in Sub-Saharan Africa in considering Benin, Chad, Congo, Côte d’Ivoire, Ethiopia, Gabon, Malawi, Mozambique, Rwanda, Sierra Leone, Uganda, and Zambia. The analysis indicated the presence of inequalities between under-five boys’ and girls’ mortality that reported high boy mortality(19), which is true for this study, even the difference is not too ample. This variation in boys and girls mortality also supported by other study(20), in which all the reports indicated that boys were more affected. The justification for such variation between girls and boys might be because of biological factors (boys lower resistance to infection, and higher risk of premature birth), and gender discrimination (differential feeding and medication)(21, 22). There is also a study that supported the difference of U5M among sons and girls in Ethiopia(23). In contrary, a study in Ethiopia indicated a lack of significant difference of under-five death between males and females(24).The variation might be as result of study design difference, in which the former study used a case-control design. The case control design is not appropriate to report magnitude than cross-section design.
In assessing the association of under-five mortality with predictors, we consider the gender of children. Initially, the study tries to assess the association of U5M irrespective of the deceased child’s gender. Beyond this, we try to assess the association of U5M among daughters and among sons independently. The assumption we considered is that the factors for daughters and sons might have difference. Therefore, in the final logistic regression model, female head of households ((AOR), 95%CI (0.76), (0.63, 0.91) have a preventive association with U5M in those pastoralist regions. The head of households were also associated with both sons and daughters mortality when we assessed the effect by sex. Female household heads ((0.74), (0.60, 0.93) were decreasing the odds of under-five daughters mortality. These was also true that female household heads ((0.0.80, (0.0.65, 0.0.99) were decreasing the odds of under-five sons mortality. A wealth index of poorest ((2.20), 1.42, 3.41), poorer ((2.72), (1.70, 4.33), or richer ((1.77), (1.09, 2.86) in relative to richest wealth index increase the odds of U5C mortality (25-30) irrespective of child sex. This degree of association were also happened when we assessed the association with either sons or daughters mortality in considering the gender of children. A wealth index of poorest ((1.90), (1.24, 2.89), or poorer ((1.94), (1.20, 3.16) households increase the odds of under-five daughters mortality. Similarly, the wealth index of poorest ((2.14), (1.27, 3.64), or poorer ((3.02), (1.74, 5.24) household status increase the likelihood of under-five sons mortality.Husbands who drop from secondary education increase the chance of their U5C mortality ((1.54), (0.34, 0.86) than husband who completed higher education. The result was consistent with a number of studies(26, 27, 29). The association was also happed in either sons or daughters separate analysis, but the association was preventive. Husband education, incomplete secondary school, ((AOR), (95%CI), ((0.38), (0.21, 0.70) prevent the odds of under-five sons mortality. Husband education, unable to read and write, ((AOR), (95%CI), ((1.67), (1.03, 2.70) increase the odds daughters mortality in the pastoralist regions.Children whose age was birth to 12 months ((0.72), (0.56, 0.92) were less likely to die than 48 to 59 months old children irrespective of the child sex. This association was repeated when the daughters’ dataset analyzed. Female children whose age was birth to 12 months ((0.63), (0.47, 0.85) were less likely to die than 48 to 59 months old children.Having multiple birth ((2.39), (1.25, 4.56) during the first parity increase under-five mortality compared to singleton. This is similar with a study conducted from 2016 EDHS at national level that reported an odds of under-five mortality (AOR=4.74, CI= [3.34, 6.69], P<0.000) in multiple births compared to singletons (5, 23, 31-33). This association was also repeated when we assess the daughters dataset that multiple births during the first parity ((2.61,), (1.29, 5.23), and second parity ((2.30), (1.11, 4.76) predisposed under-five daughters to mortality than single births.In the daughters data set, female children born from Muslim ((2.70), (1.64, 4.44) family were more likely to die than Ethiopian orthodox religion follower.Similarly, the sons’ data set indicated that male children born from Muslim ((2.04), (1.28, 3.23), Catholic ((17.75), (5.85, 53.86), and other religion followers ((6.01), (2.12, 16.73) were more likely to die than Ethiopian orthodox religion follower. Average child size at birth ((0.68), (0.51, 0.90) prevent under-five daughters mortality than very large daughters at birth. This agreed with a study derived from the 2016 EDHS data (5, 30, 34).Unplanned birth ((1.70), (1.03, 2.81) increase the likelihood of sons death than planned births. This contradict with a study that reported a preventive association(26). But this association is consistent with a study that reported from India (27, 35).History of short, and rapid breathing ((1.74), (1.22, 2.48) increase the probability of under-five sons’ death than children who had not it. This association is supported by WHO report that indicated respiratory infections were one of the causes of U5M(36). Unlike the previous study conducted in Ethiopia(31), none of the pastoralist region have no association with U5M. Since the causes of high under-five mortality in resource poor settings are complex and merit concerted efforts to clarify their implications to improve child survival(37), we try to evaluate the prevalence of U5M by selecting the most susceptible areas and identified factors through triangulating the data set by sex as mentioned above. The government of Ethiopia and the pastoralist regions will utilize this evidence to draft police as per the following recommendation we stated in the conclusion section.