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For example, the increase of LLIN use has induced the rapid expansion of mosquito insecticide resistance.More than two persons often share one net, which increases the infection risk. To overcome these problems, two new mosquito nets were\n developed, one incorporating piperonyl butoxide and another covering ceilings and open eaves. We designed a cluster randomized \ncontrolled trial (cRCT) to evaluate these nets based on the information provided in the present preliminary study. Results: Nearly 75% of the anopheline population in the study area in western Kenya was Anopheles gambiae s. l., and the remaining was Anopheles funestus s. l. More female anophelines were recorded in the western part of the study area. The number of anophelines increased with rainfall. We planned to have 80% power to detect a 50% reduction in female anophelines between the control group and each intervention group. The between-cluster coefficient of variance was 0.192. As the number of clusters was limited to 4 due to the size of the study area, the estimated cluster size was 7 spray catches with an alpha of 0.05. Of 1619 children tested, 626 (48%) were Plasmodium falciparum positive using a rapid diagnostic test (RDT). The prevalence was higher in the northwestern part of the study area. The number of children who slept under bed nets was 929 (71%). The P. falciparum RDT-positive prevalence (RDTpfPR) of net users was 45%, and that of non-users was 55% (OR 0.73; 95% CI 0.56, 0.95). Using 45% RDTpfPR of net users, we expected each intervention to reduce prevalence by 50%. The intracluster correlation coefficient was 0.053. With 80% power and an alpha of 0.05, \nthe estimated cluster size was 116 children. Based on the distribution of children, we modified the boundaries of the clusters and \nestablished 300-m buffer zones along the boundaries to minimize a spillover effect. 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A preliminary study on designing a cluster randomized control trial of two new mosquito nets to prevent malaria parasite infection
http://hdl.handle.net/10069/40454
http://hdl.handle.net/10069/4045420c30d13-fda9-4255-bff2-15d3cd761c19
名前 / ファイル | ライセンス | アクション |
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TMH48_98.pdf (1.9 MB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2020-12-22 | |||||
タイトル | ||||||
タイトル | A preliminary study on designing a cluster randomized control trial of two new mosquito nets to prevent malaria parasite infection | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Malaria | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | LLIN | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Ceiling | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Study design | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | RCT | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_6501 | |||||
資源タイプ | journal article | |||||
著者 |
Minakawa, Noboru
× Minakawa, Noboru× Kongere, James O.× Sonye, George O.× Lutiali, Peter A.× Awuor, Beatrice× Kawada, Hitoshi× Isozumi, Rie× Futami, Kyoko |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Background: Although long-lasting insecticidal nets (LLINs) are the most effective tool for preventing malaria parasite transmission, the nets have some limitations. For example, the increase of LLIN use has induced the rapid expansion of mosquito insecticide resistance.More than two persons often share one net, which increases the infection risk. To overcome these problems, two new mosquito nets were developed, one incorporating piperonyl butoxide and another covering ceilings and open eaves. We designed a cluster randomized controlled trial (cRCT) to evaluate these nets based on the information provided in the present preliminary study. Results: Nearly 75% of the anopheline population in the study area in western Kenya was Anopheles gambiae s. l., and the remaining was Anopheles funestus s. l. More female anophelines were recorded in the western part of the study area. The number of anophelines increased with rainfall. We planned to have 80% power to detect a 50% reduction in female anophelines between the control group and each intervention group. The between-cluster coefficient of variance was 0.192. As the number of clusters was limited to 4 due to the size of the study area, the estimated cluster size was 7 spray catches with an alpha of 0.05. Of 1619 children tested, 626 (48%) were Plasmodium falciparum positive using a rapid diagnostic test (RDT). The prevalence was higher in the northwestern part of the study area. The number of children who slept under bed nets was 929 (71%). The P. falciparum RDT-positive prevalence (RDTpfPR) of net users was 45%, and that of non-users was 55% (OR 0.73; 95% CI 0.56, 0.95). Using 45% RDTpfPR of net users, we expected each intervention to reduce prevalence by 50%. The intracluster correlation coefficient was 0.053. With 80% power and an alpha of 0.05, the estimated cluster size was 116 children. Based on the distribution of children, we modified the boundaries of the clusters and established 300-m buffer zones along the boundaries to minimize a spillover effect. Conclusions: The cRCT study design is feasible.As the number of clusters is limited, we will apply a two-stage procedure with the baseline data to evaluate each intervention. |
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書誌情報 |
Tropical Medicine and Health 巻 48, 号 1, p. art.no.98, 発行日 2020-12-07 |
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出版者 | ||||||
出版者 | BioMed Central Ltd. | |||||
EISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 13494147 | |||||
DOI | ||||||
関連タイプ | isIdenticalTo | |||||
識別子タイプ | DOI | |||||
関連識別子 | 10.1186/s41182-020-00276-x | |||||
権利 | ||||||
権利情報 | c The Author(s). 2020 Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you giveappropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commonslicence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commonslicence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. | |||||
著者版フラグ | ||||||
出版タイプ | VoR | |||||
出版タイプResource | http://purl.org/coar/version/c_970fb48d4fbd8a85 | |||||
引用 | ||||||
内容記述タイプ | Other | |||||
内容記述 | Tropical Medicine and Health, 48(1), art.no.98; 2020 |