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Place of food cooking is associated with acute respiratory infection among under-five children in Ethiopia: multilevel analysis of 2005–2016 Ethiopian Demographic Health Survey data

Abstract

Background

Globally, acute respiratory infections are among the leading causes of under-five child mortality, especially in lower-income countries; it is associated with indoor exposure to toxic pollutants from solid biomass fuel. In Ethiopia, 90% of the population utilizes solid biomass fuel; respiratory illness is a leading health problem. However, there is a paucity of nationally representative data on the association of household cooking place and respiratory infections. Besides, evidence on the variability in the infection based on the data collected at different times is limited. Therefore, this study is intended to assess the association of food cooking place with acute respiratory infections and the variability in households and surveys.

Methods

The current analysis is based on the Ethiopian Demographic and Health Survey data collected in 2005, 2011, and 2016 and obtained via online registration. The association of food cooking place with acute respiratory infection was assessed using multilevel modeling after categorizing all factors into child level and survey level, controlling them in a full model. The analyses accounted for a complex survey design using a Stata command “svy.”

Result

A total of 30,895 under-five children were included in this study, of which 3677 (11.9%) children had an acute respiratory infection, with 12.7% in 2005, 11.9% in 2011, and 11.1% in 2016. The risk of having an infection in under-five children in households that cooked food outdoors was 44% lower (AOR = 0.56, 95% CI = 0.40, 0.75) compared to those households that cooked the food inside the house. There was a statistically significant difference among the children among surveys to have an acute respiratory infection.

Conclusion

The risk of having children with acute respiratory infection is lower in the households of cooking food outdoor compared to indoor. The infection difference in different surveys suggests progress in the practices in either food cooking places or the fuel types used that minimize food cooking places location or the fuel types used that minimizes the risk. But, the infection is still high; therefore, measures promoting indoor cooking in a well-ventilated environment with alternative energy sources should take place.

Background

Acute respiratory infection (ARI) is a leading cause of mortality in children under 5 years old worldwide [1]. About 97% of ARI cases occur in low- and middle-income countries, with nearly 70% occurring in South Asia and sub-Saharan Africa [2]. The World Health Organization report in 2015 shows that ARI accounts for 16% of all deaths globally, killing around one million children under the age of 5 years [3]. In 2017, of nearly 5.4 million under-five children who died worldwide, roughly half were in sub-Saharan Africa, with ARI contributing the highest number of deaths [4]. The recent analysis of the demographic and health survey data (DHS) in sub-Saharan countries shows that the overall prevalence is 25.3% [5].

Multiple risk factors are associated with ARI including exposure to toxic pollutants in the indoor environment, biomass smoke being one of the most common ones [6,7,8,9,10]. Smoke from biomass and coal contains a large number of particulate matters of various sizes such as nitrogen dioxide, carbon monoxide, methylene chloride, and dioxins [7, 8, 10]. Women and under-five children are exposed to these pollutants because of the long periods of time spent in close proximity to fires while cooking and heating [11]. Pollutants generated in kitchens and heating areas can also spread into living areas where children and other household members are exposed [11, 12]. Globally, despite the health risks of the use of biomass fuels such as animal dung, crop residues, wood, and coal for cooking and heating purposes continues, approximately 3 billion people continue to use these various biomass fuels worldwide [13, 14]. The recent analysis of demographic and health data in Afghanistan illustrated that in addition to using such fuels, the location used to cook the food had a significant association with acute respiratory infections [15]. The evidence indicates controlling the exposure to biomass fuels could reduce the risk of adverse children and adult health outcomes by 20–50% [16]. Outdoor cooking and stove ventilation were some of the measures that substantially reduced the risks [15, 17, 18].

In Ethiopia, there are 55 deaths per 1000 live births in children under-five due to acute respiratory infection, placing it among the world’s highest mortality rates [19]. Prior studies indicated that maternal age, residence, maternal hand hygiene information [20], maternal literacy, smoking, use of animal dung as a fuel source, nutritional status [21], absence of a separate kitchen, and lack of windows were significantly associated with acute respiratory infections [22,23,24,25].

In Ethiopia, more than 90% of the population uses solid biomass fuel [26,27,28]; there is a paucity of evidence on the location of cooking food and the association with ARI in children under-five, based on a nationally representative community-based study. Moreover, there is limited evidence on whether there is variability in the infection over time. Therefore, the current study is intended to assess the association of the location of cooking food with acute respiratory infection in under-five children and its variability in households and surveys based on demographic and health survey data collected in three different time periods. The results will provide evidence for policymakers for better intervention in progressing the under-five mortality and morbidity of the SDG strategic plan.

Methods

Study setting

According to the world population review report in 2020, Ethiopia has an estimated 114.96 million population, making it the second-largest country in Africa, the twelfth most populous country worldwide [29]. Ethiopia has a population growth rate of 3.02% per year and a fertility rate of 4.73% [29, 30]. The administrative structure consists of nine regional states (Tigray, Afar, Amhara, Oromiya, Somali, Benishangul-Gumuz, Southern Nations Nationalities and People (SNNP), Gambela, and Harari) and two city administrations (Addis Ababa and Dire Dawa) [31].

Study design, sample size, and sampling procedure

The Ethiopian Demographic and Health survey 2005, 2011, and 2016 were used for the current study. The surveys were conducted among women aged 15–49 years from urban and rural areas in the nine regions and two cities. During the surveys, each of the regions was stratified into urban and rural areas. Samples of Enumeration Areas (EAs) were selected independently from each stratum from where the samples were determined using a stratified, two-stage cluster design. The number of EAs from the 2016 survey was 645 (202 from urban and 443 from rural); for the 2011 survey, 624 (187 from urban and 437 from rural areas); for the 2005 survey, and 540 (145 from urban and 395 from rural areas) [26,27,28]. The number of households and clusters included was 14,500 from 540 clusters in 2005; 17,817 from 624 clusters in 2011; and 16,650 from 645 clusters in 2016. The sampling procedure applied is as follows: first, clusters were selected from the enumeration area list from the population and housing census sample frame. The sampling frame for the 2005 survey was based on the 1997 census; the 2011 and 2016 surveys were based on the 2007 census. Secondly, the households were selected after listing the households in all selected enumeration areas for the sampling frame [26,27,28]. Based on the data obtained, the number of children included in the three surveys was 30,985 (9517 from the 2005 survey, 11,176 from the 2011 survey, and 10,291 from the 2016 survey).

Method of data collection

The data collection method was face-to-face interviewing of mothers or respondents, as indicated elsewhere [26,27,28].

Outcome variable

The outcome of interest was acute respiratory infection (ARI). The DHS survey assessed whether the children of participating mothers suffered from a cough in the last 2 weeks before the survey. The respondents were further probed whether the cough was associated with shortness of breath or rapid breathing problems during the specified period. Therefore, children who suffered a cough with shortness of breathing were considered to have ARI.

During each survey, households were asked about the type of fuels they reportedly used and the place of cooking food. Respondents were categorized into solid biomass fuel users (families that used wood, charcoal, kerosene, grass, crop products) or non-solid biomass fuel users (electricity, liquid petroleum gas, natural gas, biogas). Besides, households were asked about the location where they cooked the food (either inside the house, outside, or in a separate building).

Independent variables

Variables were selected based on prior findings that revealed their association with children’s ARI [5, 15, 23, 25, 32,33,34,35,36]. These were the child’s age, place of cooking food, maternal age, maternal education, paternal education, residency, nutrition status, household wealth quintile, frequency of watching television, frequency of listening to radio, maternal occupation, and paternal occupation, as indicated elsewhere. Stunting, underweight, and wasting was assessed based on the World Health Organization Child Growth Standards and the National Center for Health Statistics (NCHS)/WHO international growth reference [37].

Variables were classified into three levels: (1) child-level variables (age of the child, sex of the child, size of the child, child weight, child stunting, child wastage, and breastfeeding), (2) household-level variables (wealth quintiles, water sources, toilet type, residence, maternal education, maternal occupation, paternal education, paternal occupation, frequency of listening radio, and frequency of watching television), and (3) survey-level variables (the type of fuel, location of cooking food). However, the type of fuel was excluded from analysis as more than 98% of households were reportedly using solid biomass fuel.

Data analysis

Data were analyzed using the Stata 14 version (Stata Corp LP, College Station, TX, USA). The “svy” command was used to weigh the survey data to adjust cluster sampling design in the merged data set of three surveys. First, the study population’s characteristics were presented by ARI status and by exposure variables. The association of ARI with the place of cooking food was examined using a three-level multilevel logistic regression to assess variability in the outcome using a household and survey as level. A multilevel analysis was used due to the level of observation at which the child’s ARI status is nested within households and surveys. Inclusion of the higher-level (household and survey-level) characteristics as child-level factors can lead to the understatement of standard error, as one value was replicated across all members of the same group. Using a multilevel model, the value was applied once, at the group level, and information from the pooled regression helped generate reliable estimates even for groups with insufficient numbers of first-level observations. The model also allowed to include error terms at each level, tracking changes in variance across models [38, 39]. The model is based on the following equation:

$$ {\mathrm{Y}}_{\mathrm{i}}={\mathrm{a}}_{\mathrm{jk}}+{\upbeta \mathrm{X}}_{\mathrm{i}}+{\mathrm{e}}_{\mathrm{i}}\kern0.6em i=1,\hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-}, \mathrm{I} $$
(1)
$$ {\mathrm{a}}_{\mathrm{j}\mathrm{k}}={\mathrm{g}}_0^{\mathrm{j}}+{\mathrm{g}}_{\mathrm{k}}+{\mathrm{e}}_{\mathrm{j}}\kern0.48em \mathrm{j}=1,\hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-}, \mathrm{J}\kern0.73em \mathrm{k}=1\hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-}, \mathrm{K} $$
(2)
$$ {\mathrm{g}}_{\mathrm{k}}={\mathrm{l}}_0+{\mathrm{l}}_{\mathrm{k}}+{\mathrm{D}}_{\mathrm{k}}+{\mathrm{e}}_{\mathrm{i}}\kern0.48em \mathrm{k}=1,\hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-} \hbox{-}, \mathrm{K} $$
(3)

where Yi the binary response of mother on child i about ARI status in the j household in k survey, ajk and β are the intercept and coefficient vector for child-level variables Xi, gj0 is a household-specific intercept, and gk survey-level intercept which is a function of survey-level variable Dk, survey-level coefficient lk, and survey-level intercept l0. Finally, ei, ej, and ek are error terms at each level.

Model building

Before the model building, a binary multilevel logistic regression was applied. Those variables with a p value of less than 0.2 were considered for the multivariable analysis to estimate the adjusted odds ratios and the extent of random variations between households and surveys. Three models containing variables of interest was fitted using the “svy: xtmelogit” command in Stata: model-I (empty model): model fitted without factors to test the random variability in the intercept, model-II: to assess the effect of the survey-level variable and (random intercept and slope for survey-level variables), and model-III (full model): to evaluate the impact of survey-level variables and other variables and simultaneously. In a full model, the child-related variables included were age, sex, birth weight, and nutrition status and the household-related variables were wealth quintiles, listening radio, watching television, drinking water source, toilet type, maternal age, maternal education, paternal education, paternal occupation, maternal occupation, and residence. All statistical tests were considered significant at p value < 0.05.

Ethical consideration

The three EDHS were conducted after obtaining ethical approval from the ICF Institutional Review Board (IRB), Ethiopia Health and Nutrition Research Institute Review Board, and the Ministry of Science and Technology. The data collectors were instructed in how to obtain informed consent statement and voluntary participation prior to data collection. The confidentiality of the information was maintained. For this particular study, a brief description of the protocol was submitted to the MEASURE DHS program to access and analyze the data.

Result

Socio-demographic characteristics of households with under-five children

Nine thousand nine hundred seventy-one children were included in the analysis from the 2005 survey, 10729 from the 2011 survey, and 10195 from the 2016 survey, with a total of 30895. Two-fifths of the children had an average size, and nearly one-fifth of the children had an age of 3 years and 4 years each. In total, nearly nine-tenths of the children reside in rural, 42% of the children were stunted, 30% were underweight, and 17% were wasted. The majority of participants were from rural areas, and about two-fifths were stunted. Stunting decreased over time, with 50% stunting in 2005, 42% in 2011, and 38% in 2016. Similarly, the number of underweight children also decreased from 50% (2005), 27% (2011), and 24% in 2016. Households’ experience of listening to the radio twice a week in 2005 was nearly 25% which increased to 32% in 2011 and dropped to 13% in 2016. On the other hand, household television watching increased to three times a week in 0.7% in 2005 to 8.3% in 2011 and 8.1% in 2016. Of mothers included in the survey, the majority was unemployed and more than 70% did not attend school (Table 1).

Table 1 Socio-demographics of households and under-five children characteristics, EDHS 2005–2016

Type of fuels used in the house and place of cooking food

The pooled data revealed that the proportion of households that used a solid biomass fuel as an energy source was 98.4% (95% CI = 98.1, 98.6) with 98.8% (95% CI = 98.4, 99.0), 99.5% (95% CI = 99.2, 99.7), and 96.9% (95% CI = 96.2, 97.4), respectively, in 2005, 2011, and 2016. The data concerning cooking foods’ locations indicate that 57%, 35%, and 8% cooked the foods inside the house, a separate building, and outside the house, respectively. The cooking location in each survey year shows that 71% of households cooked inside the house in 2005, and the number dropped to 43% in 2016 (Fig. 1). There was a declining trend in cooking food inside the house and an increasing trend of cooking in a separate house. Cooking the food outside the house increased from 5.8% in 2005 to 10.7% in 2016.

Fig. 1
figure1

Household food cooking place, Ethiopian Demographic and Health Surveys, 2005-2016. The percent distribution is calculated by dividing the number of households reportedly cooking food inside the house, outside the house and in separate house to total number of households in each survey

Acute respiratory infection

Of the 30,895 children included in three surveys, 11.9% had an acute respiratory infection, 12.7% in 2005, 11.9% in 2011, and 11.1% in the 2016 survey. The results indicate a decline in the number of children with ARI from 2005 to 2011, although only slightly decreased from 2011 to 2016.

The distribution of ARI across variable categories

The prevalence of acute respiratory infection is 12.6% in the households that cooked the food inside the house. The prevalence of the disease is higher in the households that cooked the food outside the house and in a separate building with the respective percentage of 9.6% and 11.2%. The prevalence of ARI among families using solid biomass fuel is 11% compared with those who used non-solid fuel, which is about 6%. In addition, a low prevalence of infection was found in those mothers who reported ever breastfeeding, high paternal education status, and professional workers. Similarly, children of mothers with a high education status, between 44 and 49 years old reported a low ARI. Again, the mothers listening to the radio daily, watching television daily, and in the highest wealth quintiles also reported a lower ARI (Table 2).

Table 2 Acute respiratory infection on under-five children across different variable selected, EDHS 20052016

The association of ARI with place of cooking food in the house

The empty model indicates a variation in the risk of having ARI among children in households and surveys with respect to random intercepts of 0.13 and 0.37. In model-II, where the survey-level variables (place of food cooking) were used, families cooking the food outdoor had a 30% (95% CI = 0.56, 0.88) lower risk of having under-five children with ARI compared to those cooking inside the home. The random intercepts for the households and survey in model-II also indicate significant differences among households within the survey (between households of the same study) and surveys having under-five children with ARI. The full model (after including all the variables in the models) showed that cooking the food outdoor had a 44% (AOR = 0.56, 95% CI = 0.40, 0.75) lower risk of having under-five children with ARI compared to cooking inside the house. Similarly, the children’s risk of having ARI among households that cooked the food in a separate kitchen was 19% less likely (AOR = 0.81, 95% CI = 0.69, 0.96). The standard deviations of random intercepts and random slopes in a full model were higher than their respective standard errors showing variability from survey to survey. However, the standard deviation of the household’s random intercepts was near zero, meaning there was no house to house variation in this term (Table 3).

Table 3 Multilevel logistic regression on the association of food cooking places with ARI in under-five children in controlling other variables, EDHS, 2005–2016

Discussion

The three surveys show that more than 98% of the households use solid biomass fuel for cooking food even if these fuels are known to be emitting a large number of indoor air pollutants which implies that the children’s exposure to biomass and charcoal fuel leads to a high chance of developing ARI [40]. This study found only 9.6% of the total households prepared food outside the living quarters, which was different from other studies conducted in African countries that reported 18% in East Africa and 43% in West Africa [41].

The current finding shows a lower risk of having an ARI in children under-five in households that cook the food outside the home compared to those cooking inside the house (after controlling for other variables). This finding is consistent with a prior study conducted in 27 African countries [41] and Afghanistan [15]. This indicates that cooking food in a separate building will lower the risk of ARI in children compared to cooking inside a building; this complies with findings from Tanzania [42], Nigeria [43], and the most recent one from India [18], all based on demographic and health survey data.

The older children have a lower ARI risk than children below 1 year, suggesting less exposure to induced indoor air pollutants due to less time spent indoors. Mothers with younger children prefer to cook indoors while caring for their children. The finding is similar to previous studies in urban areas of the Oromia region, Ethiopia [33]; in Wondo-Genet district, southern Ethiopia [23]; and in Afghanistan [34].

The mother’s watching of television at least once a week was protective of her child to develop ARI, which is consistent with the prior study [32]. Watching television may increase awareness about the risks of solid biomass fuel, cooking place, and disseminate knowledge about the programs and policies related to their child’s healthcare services.

The variation in the number of children with ARI among households of different surveys from multilevel modeling suggests a change in the practice of families using non-solid biomass or preparing their food outside and/or ventilated kitchen. This could result from a country-level effort to improve the use of non-solid biomass fuels, and improved stove use, by health extension workers since 2003 [44,45,46,47,48].

The higher risk of having children under-five with ARI in the households while cooking inside compared to both the outdoor environment and separate buildings implies that exposures to a high concentration of particulate matter (PM10) and NO2 are predisposing factors for ARI, as reported in a prior study in Tanzania [42], and poor ventilation of the house [40]. Thus, children in households that cook food inside the homes were exposed to the pollutants, resulting in lung function impairment. A prior finding revealed a significant reduction in forced expiratory lung volumes in biomass fuel users [42]. The histopathological finding in under-five children who spent, on average, 4–5 h a day inside the kitchen revealed a detailed necroscopy [43]. Biomass smoke exposure increased forced expiratory volume (FEV)1/force vital capacity (FVC), indicating a significant loss of vital capacity sufficiently high to be responsible for both obstructive and restrictive pulmonary diseases in long exposure [44]. As the duration and the intensity of exposure increase, the probability of having altered pulmonary function test results is higher [26].

The problem can be reduced by changing the country’s community practices, mainly shifting to alternative energy sources, using an improved stove, and behavior change. These were indicated to be effective [49, 50]. A prior study revealed improved stoves that effectively reduce the pollutants’ emission in the country [51], although the use is low [52]. Therefore, effort on the wide-scale implementation of Climate Resilient Green Economy (CRGE) with the dissemination of improved stoves as one of the strategies remains essential to improve the coverage and use to minimize the problem [53].

Strengths and limitations of the study

This study’s strengths include that it used nationally representative data with a representative sample size collected in three different periods and analyzed using multilevel modeling. However, it has the following limitations: the data were based on a cross-sectional study design. The variables like ARI and size of the children were based on the respondent’s self-report, leading to bias.

Conclusion

More than 10% of children suffer from an acute respiratory infection, and about 98% of households used solid biomass fuel in the country. In the families where the food was cooked outdoor, there was a lower risk of having children with ARI than that cooked inside the house. There was an inclining trend in the number of households that cooked the food in the outdoor environments and a separate building. The multilevel modeling shows a variation in the infection of the disease among households of different surveys. But still, an effort remains mainly on awareness creation on cooking indoor homes of well-ventilated and shifting to alternative energy sources. Besides, promoting the use of improved stoves can affect reducing the problem in the country. This can be through the integration of health sectors, mainly health extension programs of the Ministry of Health, designed to deliver health services at the grass-root level, including healthy housing, and the Ministry of Water, Irrigation, and Energy providing alternative energy sources, mainly biogas and others.

Availability of data and materials

The datasets used and/or analyzed during the current study belong to DHS program. The authors can provide in discussion with the data owner.

Abbreviations

ARI:

Acute respiratory infection

FEV

Forced expiratory volume

FVC

Force vital capacity

OR

Odds ratio

DHS

Demographic Health Survey

PM10

Particulate matter

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Acknowledgements

We would like to thank Measure DHS for providing the dataset to conduct this study. We also acknowledge Tara Wilfong (MD, MPH), University Orlando, Florida Area 64 connections, Global Health Consultant for USAID Feed the Future Innovation Lab for Livestock Systems, now a Fulbright Scholar in Ethiopia at Haramaya University for language edition.

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AG, SG, YM, and TA conceived and designed the study, analyzed the data, and interpreted and drafted the manuscript. The authors have read and approved the final manuscript.

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Correspondence to Abraham Geremew.

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We follow the principles and procedures of the data owner (Measure DHS Program). Each survey was conducted after the ethical clearance was obtained from the appropriate Ethics Review Committee of the country.

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The authors declare that they have no competing interest.

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Geremew, A., Gebremedhin, S., Mulugeta, Y. et al. Place of food cooking is associated with acute respiratory infection among under-five children in Ethiopia: multilevel analysis of 2005–2016 Ethiopian Demographic Health Survey data. Trop Med Health 48, 95 (2020). https://doi.org/10.1186/s41182-020-00283-y

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Keywords

  • Acute respiratory infection
  • Food cooking place
  • Solid biomass fuel