{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,13]],"date-time":"2026-02-13T04:57:59Z","timestamp":1770958679556,"version":"3.50.1"},"reference-count":27,"publisher":"BMJ","issue":"1","license":[{"start":{"date-parts":[[2020,1,7]],"date-time":"2020-01-07T00:00:00Z","timestamp":1578355200000},"content-version":"unspecified","delay-in-days":6,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100000865","name":"Bill and Melinda Gates Foundation","doi-asserted-by":"publisher","award":["OPP1158281"],"award-info":[{"award-number":["OPP1158281"]}],"id":[{"id":"10.13039\/100000865","id-type":"DOI","asserted-by":"publisher"}]},{"name":"MRC-Wellcome Trust-DFID","award":["MR\/L004283\/1"],"award-info":[{"award-number":["MR\/L004283\/1"]}]}],"content-domain":{"domain":["bmj.com"],"crossmark-restriction":true},"short-container-title":["BMJ Open"],"accepted":{"date-parts":[[2019,11,27]]},"published-print":{"date-parts":[[2020,1]]},"abstract":"<jats:sec>\n                    <jats:title>Objectives<\/jats:title>\n                    <jats:p>Studies in low-income and middle-income countries have shown an adverse association between environmental exposures including poverty. There is little literature from South Asia. We aimed to test the associations between housing, indoor air pollution and children\u2019s respiratory health and recurrent fast breathing pneumonia in a poor urban setting in Pakistan.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Setting<\/jats:title>\n                    <jats:p>Primary health centres in a periurban slum in Karachi, Pakistan.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods<\/jats:title>\n                    <jats:p>Nested matched case\u2013control study within a non-inferiority randomised controlled trial of fast breathing pneumonia (Randomised Trial of Amoxicillin vs Placebo for Pneumonia (RETAPP)) in periurban slums of Karachi, Pakistan. Cases were children aged 2\u201360 months enrolled in RETAPP with fast breathing pneumonia who presented again with fast breathing between 8 weeks and 12 months after full recovery. Controls, selected in a 2:1 ratio, were age-matched participants who did not represent. Multivariable conditional logistic regression analysis was undertaken to explore associations with potentially modifiable environmental predictors including housing type, indoor air quality, exposure to tobacco smoke, outdoor pollution, household crowding, water and sanitation quality, nutritional status, immunisation completeness, breast feeding and airways hyperactivity.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Fast breathing recurred in 151 (3.7%) of children out of the total (4003) enrolled in the trial. Poor-quality housing of either katcha or mixed type strongly predicted recurrence with adjusted matched ORs 2.43 (95% CI 1.02 to 5.80) and 2.44 (1.11 to 5.38), respectively. Poor air quality, cooking fuel, inadequate ventilation, nutritional status, water, sanitation and hygiene (WASH) index, wheeze at first presentation and group of initial trial assignment were not independently predictive of recurrence.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>Poor-quality housing independently predicted recurrence of fast breathing pneumonia.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Trial registration number<\/jats:title>\n                    <jats:p>\n                      <jats:ext-link xmlns:xlink=\"http:\/\/www.w3.org\/1999\/xlink\" ext-link-type=\"clintrialgov\" specific-use=\"clinicaltrial post-results\" xlink:href=\"NCT02372461\">NCT02372461<\/jats:ext-link>\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1136\/bmjopen-2019-035277","type":"journal-article","created":{"date-parts":[[2020,1,8]],"date-time":"2020-01-08T03:55:50Z","timestamp":1578455750000},"page":"e035277","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":4,"title":["Recurrence of WHO-defined fast breathing pneumonia among infants, its occurrence and predictors in Pakistan: a nested case\u2013control analysis"],"prefix":"10.1136","volume":"10","clinical-trial-number":[{"clinical-trial-number":"nct02372461","registry":"10.18810\/clinical-trials-gov","type":"postResults"}],"author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1789-0436","authenticated-orcid":false,"given":"Nick","family":"Brown","sequence":"first","affiliation":[{"name":"International Maternal and Child Health, Department of Women\u2019s and Children\u2019s Health, Uppsala University, Academiska Sjukhuset, Uppsala, 75185, Sweden"},{"name":"Department of Child Health, Aga Khan University Hospital, National Stadium Rd, Karachi, Sindh, 74800, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Arjumand","family":"Rizvi","sequence":"additional","affiliation":[{"name":"Department of Child Health, Aga Khan University Hospital, National Stadium Rd, Karachi, Sindh, 74800, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Salima","family":"Kerai","sequence":"additional","affiliation":[{"name":"University of British Columbia, Vancouver, British Columbia, Canada"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Muhammad Imran","family":"Nisar","sequence":"additional","affiliation":[{"name":"Department of Child Health, Aga Khan University Hospital, National Stadium Rd, Karachi, Sindh, 74800, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Najeeb","family":"Rahman","sequence":"additional","affiliation":[{"name":"Department of Child Health, Aga Khan University Hospital, National Stadium Rd, Karachi, Sindh, 74800, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Benazir","family":"Baloch","sequence":"additional","affiliation":[{"name":"Department of Child Health, Aga Khan University Hospital, National Stadium Rd, Karachi, Sindh, 74800, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5874-4358","authenticated-orcid":false,"given":"Fyezah","family":"Jehan","sequence":"additional","affiliation":[{"name":"Department of Child Health, Aga Khan University Hospital, National Stadium Rd, Karachi, Sindh, 74800, Pakistan"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"239","published-online":{"date-parts":[[2020,1,7]]},"reference":[{"key":"2025121514112327000_10.1.e035277.1","doi-asserted-by":"crossref","first-page":"93","DOI":"10.5812\/jcp.10273","article-title":"Epidemiology of lower respiratory tract infections in children","volume":"3","author":"Boloursaz","year":"2013","journal-title":"J Compr Ped"},{"key":"2025121514112327000_10.1.e035277.2","unstructured":"World Health Organization . 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