{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T20:06:39Z","timestamp":1772136399119,"version":"3.50.1"},"reference-count":28,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2023,4,17]],"date-time":"2023-04-17T00:00:00Z","timestamp":1681689600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2023,4,17]],"date-time":"2023-04-17T00:00:00Z","timestamp":1681689600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["npj Digit. Med."],"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    Undetected and unmonitored hypertension carries substantial mortality and morbidity, especially during pregnancy. We assessed the accuracy of OptiBP\n                    <jats:sup>TM<\/jats:sup>\n                    , a smartphone application for estimating blood pressure (BP), across diverse settings. The study was conducted in community settings: Gaibandha, Bangladesh and Ifakara, Tanzania for general populations, and Kalafong Provincial Tertiary Hospital, South Africa for pregnant populations. Based on guidance from the International Organization for Standardization (ISO) 81,060\u20132:2018 for non-invasive BP devices and global consensus statement, we compared BP measurements taken by two independent trained nurses on a standard auscultatory cuff to the BP measurements taken by a research version of OptiBP\n                    <jats:sup>TM<\/jats:sup>\n                    called CamBP. For ISO criterion 1, the mean error was 0.5\u2009\u00b1\u20095.8\u2009mm Hg for the systolic blood pressure (SBP) and 0.1\u2009\u00b1\u20093.9\u2009mmHg for the diastolic blood pressure (DBP) in South Africa; 0.8\u2009\u00b1\u20097.0\u2009mmHg for the SBP and \u22120.4\u2009\u00b1\u20094.0\u2009mmHg for the DBP in Tanzania; 3.3\u2009\u00b1\u20097.4\u2009mmHg for the SBP and \u22120.4\u2009\u00b1\u20094.3\u2009mmHg for the DBP in Bangladesh. For ISO criterion 2, the average standard deviation of the mean error per subject was 4.9\u2009mmHg for the SBP and 3.4\u2009mmHg for the DBP in South Africa; 6.3\u2009mmHg for the SBP and 3.6\u2009mmHg for the DBP in Tanzania; 6.4\u2009mmHg for the SBP and 3.8\u2009mmHg for the DBP in Bangladesh. OptiBP\n                    <jats:sup>TM<\/jats:sup>\n                    demonstrated accuracy against ISO standards in study populations, including pregnant populations, except in Bangladesh for SBP (criterion 2). Further research is needed to improve performance across different populations and integration within health systems.\n                  <\/jats:p>","DOI":"10.1038\/s41746-023-00804-z","type":"journal-article","created":{"date-parts":[[2023,4,17]],"date-time":"2023-04-17T07:22:22Z","timestamp":1681716142000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":11,"title":["Accuracy of a smartphone application for blood pressure estimation in Bangladesh, South Africa, and Tanzania"],"prefix":"10.1038","volume":"6","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-0672-036X","authenticated-orcid":false,"given":"Charles","family":"Festo","sequence":"first","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7826-7838","authenticated-orcid":false,"given":"Valerie","family":"Vannevel","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0044-1992","authenticated-orcid":false,"given":"Hasmot","family":"Ali","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8579-5698","authenticated-orcid":false,"given":"Tigest","family":"Tamrat","sequence":"additional","affiliation":[]},{"given":"Getrud J.","family":"Mollel","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1839-6018","authenticated-orcid":false,"given":"Tsakane","family":"Hlongwane","sequence":"additional","affiliation":[]},{"given":"Kaniz A.","family":"Fahmida","sequence":"additional","affiliation":[]},{"given":"Kelsey","family":"Alland","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3613-9672","authenticated-orcid":false,"given":"Mar\u00eda","family":"Barreix","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4991-616X","authenticated-orcid":false,"given":"Hedieh","family":"Mehrtash","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2852-2287","authenticated-orcid":false,"given":"Ronaldo","family":"Silva","sequence":"additional","affiliation":[]},{"given":"Soe Soe","family":"Thwin","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9946-2202","authenticated-orcid":false,"given":"Garrett","family":"Mehl","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2502-7819","authenticated-orcid":false,"given":"Alain B.","family":"Labrique","sequence":"additional","affiliation":[]},{"given":"Honorati","family":"Masanja","sequence":"additional","affiliation":[]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5370-682X","authenticated-orcid":false,"given":"\u04e6zge","family":"Tun\u00e7alp","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2023,4,17]]},"reference":[{"key":"804_CR1","doi-asserted-by":"publisher","first-page":"591","DOI":"10.1016\/S0140-6736(07)61299-9","volume":"370","author":"FH Messerli","year":"2007","unstructured":"Messerli, F. H., Williams, B. & Ritz, E. Essential hypertension. Lancet 370, 591\u2013603 (2007).","journal-title":"Lancet"},{"key":"804_CR2","unstructured":"Institute for Health Metrics and Evaluation Client Services. Making the World a Healthier Place for Mothers: Trends and Opportunities for Action in Maternal Health. (IHME, 2019)."},{"key":"804_CR3","doi-asserted-by":"publisher","first-page":"e323","DOI":"10.1016\/S2214-109X(14)70227-X","volume":"2","author":"L Say","year":"2014","unstructured":"Say, L. et al. Global causes of maternal death: a WHO systematic analysis. Lancet Glob. Health 2, e323\u2013e333 (2014).","journal-title":"Lancet Glob. Health"},{"key":"804_CR4","unstructured":"World Health Organization. WHO Recommendations for Prevention and Treatment of Pre-Eclampsia and Eclampsia (WHO, 2011)."},{"key":"804_CR5","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1111\/1471-0528.12735","volume":"121","author":"JP Souza","year":"2014","unstructured":"Souza, J. P. et al. Obstetric transition: the pathway towards ending preventable maternal deaths. BJOG: Int. J. Obstet. Gynaecol. 121, 1\u20134 (2014).","journal-title":"BJOG: Int. J. Obstet. Gynaecol."},{"key":"804_CR6","doi-asserted-by":"publisher","first-page":"10","DOI":"10.1002\/ijgo.12464","volume":"141","author":"M Barreix","year":"2018","unstructured":"Barreix, M. et al. Standardizing the measurement of maternal morbidity: Pilot study results. Int. J. Gynecol. Obstet. 141, 10\u201319 (2018).","journal-title":"Int. J. Gynecol. Obstet."},{"key":"804_CR7","doi-asserted-by":"publisher","first-page":"e57","DOI":"10.1016\/S2214-109X(17)30421-7","volume":"6","author":"AP Betran","year":"2018","unstructured":"Betran, A. P. et al. Provision of medical supply kits to improve quality of antenatal care in Mozambique: a stepped-wedge cluster randomised trial. Lancet Glob. Health 6, e57\u2013e65 (2018).","journal-title":"Lancet Glob. Health"},{"key":"804_CR8","unstructured":"World Health Organization. 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