Exploring the gap between coverage, access, and utilization of long-lasting insecticide-treated nets (LLINs) among the households of malaria endemic districts in Bangladesh
Malaria Journal volume 17, Article number: 455 (2018)
Malaria is still a major public health concern in Bangladesh in spite of mass distribution of long-lasting insecticide-treated nets (LLINs) as a key preventive strategy. There might be a considerable gap between coverage and actual use of nets by the population in endemic areas. This study intended to assess the gap between coverage, access to and use of LLINs among the households in malaria-endemic settings in Bangladesh.
This cross-sectional study collected data from 2640 households of 13 endemic districts of Bangladesh through three-stage cluster random sampling. The gap between coverage, access and use of LLINs were calculated using the procedure established by the Roll Back Malaria Monitoring and Evaluation Reference Group. To support the quantitative findings, qualitative data were also collected through in-depth interview, focus group discussion and key informant interview and analysed accordingly.
Of 2640 total households, 77.4% (n = 2044) possessed at least two LLINs, 56.8% (n = 1499) had insufficient access, and 18.8% (n = 495) had excess LLINs. Members of 77.9% (n = 2056) households had used LLINs the previous night and 6.0% (n = 68) did not use LLINs despite having sufficient access. LLIN use was lower in non-hill track areas, in Bengali community, in richer households and households with more than four members. Moreover, qualitative findings revealed that the major reasons behind not using LLINs were insufficient access, sleeping outside the home, migration, perceived low efficacy of LLINs, or fear of physical side effects.
Closing the access gap by providing enough nets through solid investment and well-designed behavioural change interventions are crucial for achieving and sustaining universal coverage.
Although there has been significant success in the fight against malaria over the last few decades, malaria remains a major public health and socio-economic burden . Globally, malaria accounted for 445,000 deaths in 2016 and is highly concentrated in the world’s poorest countries. In 2016, an estimated 216 million cases of malaria occurred worldwide. Most malaria cases in 2016 were in the World Health Organization (WHO) African region (90%), followed by the WHO Southeast Asian region (7%) and the WHO Eastern Mediterranean region (2%) . Bangladesh, a country in South Asia, was also endemic for malaria, while the disease is now restricted to 71 upazilas of 13 districts of the country. Nearly 80% of total deaths attributed to malaria occurred in these 13 districts in Bangladesh . Also, 90% of all malaria cases in Bangladesh are found in these 13 districts . Currently, approximately 17.5 million people are at risk of becoming infected with malaria in those districts .
The distribution of long-lasting insecticide-treated bed nets (LLINs) is one of the key intervention strategies for preventing malaria in Bangladesh . Increasing the coverage and use of LLINs is also the most preferred malaria vector control strategy in malaria-endemic countries, according to WHO recommendations . Therefore, the national malaria control programme of Bangladesh has planned to scale up the distribution of LLINs to 100% and increase coverage (to at least two LLINs per household) in malaria-endemic areas, and to eliminate malaria by 2030 . The Government of Bangladesh and an NGO consortium led by Building Resources Across Communities (BRAC) has been implementing the Global Fund to Fight AIDS, Tuberculosis and Malaria (GFATM)-funded malaria control programme since 2007 . Up to now, Bangladesh has maintained a highly cost-effective insecticide-treated net coverage compared to other malaria-endemic countries [7,8,9]. The Government has to abide by the Global Technical Strategy for Malaria (2016–2030) to attain the long-term goal of worldwide malaria elimination and eventual eradication.
According to WHO recommendation, one LLIN should be distributed for every two people at risk of malaria to ensure universal access . Since there is a high correlation between access and use of LLINs, to eliminate malaria, improving access to LLINs should be the major priority . Globally, two main indicators were being used to assess LLINs use: the “proportion of households owning at least one LLIN” and the “proportion of children under five and pregnant women sleeping under LLINs the previous night” . Consistently, these indicators show a considerable gap between coverage and actual use of nets by vulnerable groups, i.e., children and pregnant women. But the gap between coverage and required access and utilization was not completely measurable by these indicators, and was a bottleneck for assessing the LLINs access and proper usage. Although behaviour-driven failure plays a key role, evidence has shown that the main reason for non-use is lack of access to a net .
To measure the access to LLINs in a more appropriate way, the Roll Back Malaria (RBM) campaign recommended two additional core LLIN indicators . One is the “proportion of households with at least one LLIN for every two people (household access)” which allows an estimate of the coverage gap (households with no or insufficient LLINs) in a better way. However, affirmative knowledge suggests the gaps in coverage, access and use of LLINs have not yet been studied in Bangladesh. The present study hypothesized that there was an existing gap between the coverage, access and utilization of LLINs. Therefore, this study aimed to explore the gaps in terms of coverage, access and use of LLINs at the household level in 13 malaria-endemic districts in Bangladesh. The study further aimed to measure the current gap and to explore the reason behind the gap.
This study employed a cross-sectional design triangulated with qualitative research method. In this case, three-stage cluster random sampling of households was applied. In the first stage of sampling, 30 upazilas were randomly selected from 71 upazilas where LLINs have been distributed. In the second stage of sampling, four villages were randomly selected from each upazila for statistically reliable estimate. In the third stage, 22 households per village having at least one under 5 and/or pregnant woman in the household were randomly selected.
This study was conducted in 13 malaria-endemic districts in the north, northeast and southeast regions in Bangladesh bordering India and Myanmar (Fig. 1), which included Khagrachhari, Rangamati, Bandarban, Cox’s Bazar, Chittagong, Sylhet, Sunamganj, Moulvibazar, Hobiganj, Mymensingh, Netrakona, Sherpur, and Kurigram. Three hill districts: Khagrachhari, Rangamati and Bandarban, located in the hilly remote areas of Chittagong hill track (CHT), suffer from a geographical disadvantage with difficult communication and intense perennial transmission of malaria. The field data were collected between April and May 2017.
Information on socio-economic and demographic condition, coverage, access to and use of LLINs was collected from 2640 households. The respondents were mainly the household head. If the household head was not present at the time of the interview, the information was collected from the husband/wife of household head or a pregnant woman or mother of children under 5 years old (Fig. 2).
For the qualitative part, a purposive sampling strategy was employed to select information-rich cases associated with the field of interest . Two districts from two different endemic areas (CHT and non-CHT) and two villages from each district were selected. In each village, four in-depth interviews (with pregnant women) and one focus group discussion (with community people) were carried out. Another focus group discussion was conducted in each village with high-risk population groups, e.g., Jhum (cereal crop that grows in hills) cultivators, wood cutter and coal mine workers, and migrants as they often have limited access to prevention, diagnostic testing and treatment services. Three key-informant interviews were undertaken with frontline development workers of BRAC for qualitative exploration from each district.
Data collection tools and techniques
Data were collected by research assistants using a pre-tested, structured questionnaire during face-to-face interviews with respondents. Research assistants were trained prior to data collection, encompassing lectures on completing the questionnaires, mock interviews, and field practice. A multilayered monitoring system was in place to validate, standardize and maintain quality of data and tasks such as spot checking, back checking, and provided necessary feedback to the teams working in the field. Different types of checklists were used in different data collection tools for qualitative segment. A team of four temporarily recruited research assistants with anthropology background, along with the lead qualitative researcher to collect field data.
The background variables for respondents were: age (< 20, 20–29 and ≥ 30 years), gender, relationship to household head (head, spouse, other), and level of education (no education, completed grade 1–5, completed grade 6–9, completed grade 10 or more). The background variables for household heads were: gender, level of education (no education, completed grade 1–5, completed grade 6–9, completed grade 10 or more), occupation (farmer, service holder, businessman, self-employed, labourer, housewife, others). The household level characteristics were: area (CHT, non-CHT), ethnicity (Bengali, others), religion (Muslim, Hindu, Buddhist, Christian, others), household size (≤ 4, > 4), wealth quintile (low, middle, high), having at least one child under 5 (yes/no), having at least one pregnant woman (yes/no).
Construction of the wealth index was based on factor analysis [15, 16] of key socio-economic variables. The key socio-economic variables were: types of wall, floor and roof of the house, ownership of radio, television, computer, bicycle, mobile/telephone, refrigerator, wardrobe, table, chair, watch, bed, sewing machine, bike, motor vehicle, livestock, and access to solar system, electricity.
Household-based indicators were used for assessment of coverage and access of LLINs. LLIN use was recorded as whether the household member/s slept under it the night prior to the day of survey .
Proportion of households with at least one (or two) LLINs (P1)
The numerator consists of all households having at least two LLINs and the denominator is the total number of sampled households.
Proportion of households with at least one (or two) usable LLINs (P2)
The numerator consists of all households having at least two usable (no visible rift on the net) LLINs and the denominator is the total number of sampled households.
Proportion of households with access to LLINs (P3)
The numerator contains all households where the ratio between numbers of LLINs owned and the numbers of household members is 0.5 or higher while the denominator is the total number of sampled households. This indicator is also defined as households with at least one LLIN for every two people.
Proportion of households with access to LLINs if any LLINs (P4)
The numerator contains all households where the ratio between numbers of LLINs owned and the numbers of household members is 0.5 or higher while the denominator is the total number of sampled households having at least one LLIN.
Proportion of households uses LLINs the previous night (P5)
The numerator contains all households whose members slept under LLINs the previous night and the denominator is the total households in the sample.
Proportion of households that used LLINs the previous night if accessed (P6)
The numerator contains all households whose members slept under LLINs the previous night and the denominator is the total households having sufficient access to LLINs.
Households not having at least one LLIN for every two people, i.e., 1 − P3, are defined as having insufficient access to LLINs or access gap.
Intra-household net gap
Household that did not have access to LLINs despite possessing LLINs, i.e., 1 − P4, is defined as intra-household net gap.
Household that did not use LLINs the previous night despite having access, 1 − P6, is defined as the use gap of LLINs.
Descriptive analyses were conducted to show the distribution of different characteristics of the respondents and household heads with appropriate cut-offs. The Chi square test  was done to assess association of different background characteristics with LLIN coverage, access and use. Binary logistic regression  was applied to assess relationship between background characteristics and LLIN use. The final model was adjusted with area of residence, gender and education of household head, ethnicity, religion, household size, wealth quintile, status of household having at least one child under 5 years, and having at least one pregnant woman, and with respondents’ relationship to household head. The adjusted odds ratio (AOR), exponent of beta-coefficient of binary logistic regression was calculated with 95% confidence interval (95% CI). All tests were done at 5% level of significance. All analyses were performed using STATA software (Version 13.0, STATA Corp LP, TX, USA).
Information was collected from a total of 2640 households, where one-third was from CHT area and remaining from non-CHT area. The average family size was 5.5 ± 2.2, with 1.06 female to male ratio. The majority of the respondents were females (88.8%), with 20 or more years of age (91.7%). Only 13.8% respondents were household heads. Nearly one-third of respondents had no formal education and only 11.7% had completed grade 10 or more. In terms of ethnicity and religion, 79.1% were Bengali and 70.3% were Muslim. Also, 60.1% households had more than four members, 76% households had at least one child under 5 and 46.1% households had at least one pregnant woman (Table 1).
Coverage of LLINs
A total of 6048 LLINs were distributed among 2640 households with a mean 2.3 ± 1.1 LLINs per households. At the time of the survey, almost every household had at least one LLIN (99.8%), 93.1% households had at least one useable LLIN, 77.4% households had at least two LLINs, and 58.4% households had at least two useable LLINs (Table 2). The coverage of LLINs was high in hill track areas (P = 0.003 for at least two LLINs), households with female heads (P = 0.040 for at least two usable LLINs), and in rich households (P < 0.001 for at least two LLINs or at least two usable LLINs).
Access to LLINs
Only 43.2% households had sufficient access to LLINs at the time of survey (Table 3). Household access to LLINs was significantly higher in hill track area (54.1 vs 37.8%, P < 0.001), in households with female head (50.4 vs 42.5%, P = 0.021) and in households with 4 or fewer members (63 vs 30.8%, P < 0.001). Furthermore, LLIN access increased with an increase in household head’s level of education.
Use of LLINs
Out of a total 14,475 members in 2640 households, 91.7% slept under an LLIN the previous night. LLIN use was higher among females than males (92.9 vs 91.0%), and the use of LLINs among females than males increased if the household met with sufficient access (98.3 vs 97.7%) (Fig. 3).
The proportion of LLIN use by households was 77.9%, which means all the members of those households slept under an LLIN the previous night (Table 4). The households’ use of LLINs was higher in hill track areas than non-hill track areas (86.4 vs 73.4%, P < 0.001), and in households with 4 or fewer members than those with more than 4 members (90 vs 69.8%, P < 0.001). Although LLIN coverage was high, usage was reportedly low in rich households (74.2%). Moreover, households’ use of LLINs increased when they had sufficient access to LLINs (94%) (Table 4). This phenomenon is also reported in the qualitative part of the study. According to the qualitative analysis, the lack of access to LLINs was one of the most documented reasons for low utilization. Sleeping outdoors, migrating outside, feeling uncomfortable, lack of knowledge, incompatibility with sleeping arrangements, saving LLINs for another time, and perceived degraded efficacy of the nets were also reported as reasons for poor utilization of LLINs (Table 5).
LLIN coverage, access and use gaps
This study identified three broad areas of gaps in utilizing LLINs: intra-household net allocation, household inaccessibility, and proper usage of LLINs. Only 0.19% (5 out of 2640) households did not have LLINs at the time of the survey. Consequently, intra-household net gap was 56.7%, and 56.8% households had insufficient access. Contrarily, 18.8% (495 out of 2640) households had excess LLINs (i.e., more than one LLIN for every two people). Moreover, the use gap was 6%, meaning members from those 6% households who had sufficient access to LLINs did not use them the previous night.
The qualitative findings of the study also discovered some gap between coverage, access and utilization. Despite having large coverage in the respective locality, some people experienced a lack of LLINs as per the needs of family members. Daily life experience of Rasheda (pseudonym) of Netrokona district can illustrate this statement:
“Having one LLIN in a family of four members is very crucial when necessity is not able to supplement. Moreover, we might face a situation in coming days as my father-in-law would possibly come. How would it be possible to manage the situation with only one net?”
Another issue came to light regarding coverage gap which signifies that the mosquito nets were provided only among families. Individuals living separately in a mess or in shared rooms might not have received LLINs from the programme. SK from Bandarban adds:
“Someone came to me one day while we were distributing mosquito net among the listed population. He asked for a net but we were not able to serve him as we do not have permission to give it to any individual who live in a mess or shared household or who was not in our distribution list. I felt pity for him but there was nothing I could do.”
Association between background characteristics and LLIN use
The association of background factors of households with sufficient and insufficient access to LLINs is shown in Table 6. Of households with sufficient access to LLINs, LLIN use was approximately five times less for Bengali community than others (AOR 0.22, 95% CI 0.07–0.66). Besides, households with more than four members had more than double likelihood of using LLINs than households with four or fewer members (AOR 2.64, 95% CI 1.51–4.59). For households with insufficient access to LLINs, the odds of using LLINs was approximately 50% higher in hill-track areas than non-hill track areas (AOR 1.46, 95% CI 1.04–2.04). Similarly, the Bengali community had lower odds of using LLINs (AOR 0.53, 95% CI 0.30–0.94), and households with more than four members had higher odds (AOR 2.13, 95% CI 1.60–2.82). Remarkably, households with high wealth quintiles were 24% less likely to use LLINs than poor households (AOR 0.76, 95% CI 0.57–0.99). Besides, the odds of LLIN use were nearly 50% higher when there was at least one child under five in the household (AOR 1.47, 95% CI 1.03–2.08). In addition, the odds of LLIN use was 60% higher for spouses compared to household heads (AOR 1.60, 95% CI 1.12–2.27) (Table 6).
The present study assessed the gap between LLIN coverage, access and utilization in 13 malaria-endemic districts in Bangladesh, based on newly recommended Monitoring and Evaluation Reference Group (MERG) indicators [13, 20]. Reported LLIN coverage is far better (99.8%) compared to previous year’s coverage , demonstrating continuous efforts by the government and other NGOs in taking initiatives to prevent malaria. However, the qualitative findings revealed that in urban settings, the migratory people, especially bachelors who live alone had low coverage. This might be as a result of targeted LLIN distribution campaigns which mainly focus on rural and family settings. To achieve universal coverage, LLIN distribution strategies need to be promoted to address the needs of urban as well as rural settings.
To achieve universal coverage, the goal is to ensure one LLIN for every two people, as per WHO’s recommendation. The present study identified that only 43.2% households had enough LLINs for every member of that household. However, examining those households who own any LLINs revealed that the coverage of at least one LLIN for every two people was 43.3%, while it was 54.2% in the hilly areas. The intra-household net gap was 56.7%, while the gap was 45.8% in the hilly areas. Even with fairly high coverage of at least one LLIN, nearly half of the households in highly endemic areas did not have enough access to LLINs. This suggested a huge gap between coverage and access in malaria-endemic settings, which would hamper universal coverage and the national target . In contrast, 18.8% of households had extra LLINs, suggesting the inequitable distribution of LLINs in the community. These findings are consistent with other studies in a similar context [17, 21, 22]. Some households might have purchased more nets or saved some nets for times of necessity, which could be the reason for the presence of extra LLINs at the time of the survey. This was also corroborated in the qualitative part of this study.
In malaria-endemic settings, high utilization of LLINs is the central goal for the malaria control programme as LLINs are one of the most cost-effective interventions. The present study found that 77.9% of households used LLINs (all the members of those households slept under LLINs the previous night). The high utilization, in contrast to low access, indicates that more than two people were sharing a net. This was not surprising considering that children may be sharing both sleeping space and LLINs with their parents, especially in conditions where LLINs were scarce or in homes where hanging multiple nets was not possible due to limited sleeping space [23, 24].
Moreover, when households had sufficient access to LLINs their use increased to 94%, which indicates the difference between non-use due to lack of access and non-use due to behavioural failure. The vast majority of those who had access to LLINs were using them. This implies that non-use is mostly associated with lack of access, which is confirmed by the qualitative part of the study. And these findings are in line with other national level studies  which established that access is the key driver of LLIN use. Nevertheless, use of LLINs was higher in the hilly areas, in women and in households having at least one child under five, which reflects the success of extensive behaviour change communication (BCC) efforts in the past decade that encouraged LLIN use by vulnerable groups, such as women and children. These results should encourage both donors and malaria control programme officials that the effort and investment are not wasted. The malaria control programme should continue its efforts towards closing the access gap through continuous distribution of LLINs through community as well as through social marketing and retail sales.
The qualitative component of the study offers insights into the reason for not using LLINs. Outdoor sleeping practices, living alone in a mess, and migration were documented reasons for poor utilization of LLINs. Conventional LLIN promotion approaches that focus mostly on family and indoor interventions with an emphasis on women and children should be re-oriented and refocused. Several other reasons for not using LLINs were feeling uncomfortable, fear of physical problem, perceived low efficacy of LLINs, and lack of knowledge. Moreover, 6% of household members were not using LLINs even though they had enough, reflecting their behavioural failure, which demands targeted behavioural interventions.
This survey was conducted following the rainy season in the study area when mosquitoes were abundant. This should be taken into account when interpreting the findings as the season might have encouraged people to use the nets more. Outcomes in coverage and access as well as LLIN utilization could show different proportions if the study was conducted in other seasons of the year. It is challenging to investigate causation from cross-sectional design, and only association can be truly estimated. A strength of this study is direct observation that has been conducted by data collectors and research staff for all applicable questions in order to minimize response bias during the interviews.
Achieving universal coverage of LLINs was short of the targets, with a relatively wide intra-household net gap. Although higher access rate usually increases net use, there is still a gap between access and utilization. Therefore, moving towards elimination and eventual eradication, the malaria control programme needs to take into consideration three important aspects: (1) ensuring sufficient provision of nets to every household; (2) targeting specific population groups to achieve and maintain universal LLIN coverage; and, (3) concentrating on well-designed behavioural change interventions to resolve behaviour-driven non-use. To achieve and sustain universal user coverage of LLINs in malaria-endemic areas, solid investment and well-designed BCC interventions are mandatory.
adjusted odds ratio
behaviour change communication
Building Resources Across Communities
Chittagong hill tract
Global Fund to Fight AIDS, Tuberculosis and Malaria
long-lasting insecticide-treated net
Monitoring and Evaluation Reference Group
World Health Organization
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MR and FK conceived and designed the study. FK, TRC, MSR and MBH contributed to the literature search and data collection. MBH performed statistical analysis. FK, MBH and MSR participated in the result interpretation. FK, MBH, MSR and TRC drafted the manuscript. MAI, MR, MK, SN and FK contributed in critical review and finalized the manuscript. FK had primary responsibility for final content. All authors read and approved the final manuscript.
We thank the staff of Malaria Prevention and Control Programme of BRAC for providing appropriate cooperation and Mr. John Thiemel for editing assistance. We also thank the participants of this study to give us their valuable time and insight.
The authors declare that they have no competing interests.
Availability of data and materials
The datasets used and/or analysed during the current study are available from the corresponding author on reasonable request.
Consent to participate
The purpose of the study was described to respondents. Both verbal and written consent was given by respondents prior to the interview after explaining the right to refuse participation or decline any question item at any point of time during the interview. The respondents were ensured of the confidentiality of information provided.
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Ethics approval and consent to participate
All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Ethical approval was obtained from the Ethical review committee of Research and Evaluation Division, BRAC.
The author(s) disclosed receipt of the following financial support for the research, authorship, and/or publication of this article: Partnership Arrangement between BRAC and The Global Fund to Fight AIDS, Tuberculosis and Malaria (GFATM).
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Khanam, F., Hossain, M.B., Chowdhury, T.R. et al. Exploring the gap between coverage, access, and utilization of long-lasting insecticide-treated nets (LLINs) among the households of malaria endemic districts in Bangladesh. Malar J 17, 455 (2018). https://doi.org/10.1186/s12936-018-2610-0