International Journal of Preventive Medicine (Int J Prev Med)2008-7802151202405213237EN1 Industrial Diseases Research Center, ShahidSadoughi University of Medical Sciences, Yazd Province1 Industrial Diseases Research Center, ShahidSadoughi University of Medical Sciences, Yazd Province1 Industrial Diseases Research Center, ShahidSadoughi University of Medical Sciences, Yazd Province1 Industrial Diseases Research Center, ShahidSadoughi University of Medical Sciences, Yazd ProvinceDepartment of Occupational Medicine, ShahidSadoughi University of Medical Sciences, Yazd Province1 Industrial Diseases Research Center, ShahidSadoughi University of Medical Sciences, Yazd Province20240521<p>Background: Impact/impulse and continuous noise are two main causes of noise‑induced hearing loss (NIHL) in workplaces. The aim of this study was to compare the effects of impulse/impact noise and continuous noise on hearing status. Methods: In this study, 259 workers referred to the occupational medicine clinic of Shahid Rahnemoun hospital, Yazd, Iran, entered the study and were divided into two groups: with exposure to impact/impulse noise and with exposure to continuous noise. Hearing thresholds were measured and compared between the two groups by pure‑tone audiometry (PTA). The frequency of hearing loss and audiometric notch according to the results of PTA was compared between the two groups. Data were analyzed by SPSS (ver. 16) using Student’s t‑test, Chi‑square test, and Mann–Whitney U test. Results: Hearing thresholds were significantly higher at all frequencies in the impact noise group. The hearing threshold at 6000 Hz was higher than other frequencies in both groups. The frequency of hearing loss at high frequencies was higher in the impact group. The frequency of audiometric notch was not significantly different between the two groups. Conclusions: The results of this study showed that hearing loss after exposure to impact/impulse noise is probably more frequent and more severe than exposure to continuous noise, but the pattern of hearing loss is similar in both types of noise exposure.</p><p> </p><p><span class="ej-journal-name" style="box-sizing: inherit; font-style: italic; font-weight: 500; color: #3b3030; font-family: 'Fira Sans', sans-serif; font-size: 14px; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">International Journal of Preventive Medicine<span> </span></span><span id="ej-journal-date-volume-issue-pg" style="box-sizing: inherit; color: #3b3030; font-family: 'Fira Sans', sans-serif; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"><a style="box-sizing: border-box; color: #005b92; text-decoration: none; background-color: transparent; cursor: pointer; outline: 0px;" href="https://journals.lww.com/ijom/toc/2024/01310">15():2, January 2024.</a></span><span style="box-sizing: inherit; color: #3b3030; font-family: 'Fira Sans', sans-serif; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;"><span> </span>|<span> </span></span><span class="ej-journal-doi" style="box-sizing: inherit; font-style: italic; font-weight: 500; color: #3b3030; font-family: 'Fira Sans', sans-serif; font-size: 14px; font-variant-ligatures: normal; font-variant-caps: normal; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial;">DOI:<span> </span></span><span style="color: #3b3030; font-family: 'Fira Sans', sans-serif; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">10.4103/ijpvm.ijpvm_368_21</span></p><p><span style="color: #3b3030; font-family: 'Fira Sans', sans-serif; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">Corresponding Author: Prof. Amir Houshang Mehrparvar</span></p><p><span style="color: #3b3030; font-family: 'Fira Sans', sans-serif; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">E-Mail: ah.mehrparvar@gmail.com</span></p><p><span style="color: #3b3030; font-family: 'Fira Sans', sans-serif; font-size: 14px; font-style: normal; font-variant-ligatures: normal; font-variant-caps: normal; font-weight: 400; letter-spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-transform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0px; white-space: normal; background-color: #ffffff; text-decoration-thickness: initial; text-decoration-style: initial; text-decoration-color: initial; display: inline !important; float: none;">You can also search for this author in: <a title="PubMed" href="https://pubmed.ncbi.nlm.nih.gov/?term=%28Amir+Houshang+Mehrparvar%5BAuthor%5D%29+AND+%28Shahid+Sadoughi+University+of+Medical+Sciences%5BAffiliation%5D%29">PubMed</a>  <a title="Google Scholar" href="https://scholar.google.com/scholar?hl=en&amp;as_sdt=0%2C5&amp;q=Amir+Houshang+Mehrparvar&amp;btnG=">Google Scholar</a><br /></span></p><p> </p>http://ijpm.mui.ac.ir/index.php/ijpm/article/view/2894http://ijpm.mui.ac.ir/index.php/ijpm/article/download/2894/717718735