{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,29]],"date-time":"2026-10-29T17:44:19Z","timestamp":1793295859685,"version":"4.5.0"},"reference-count":21,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2011,12,21]],"date-time":"2011-12-21T00:00:00Z","timestamp":1324425600000},"content-version":"vor","delay-in-days":354,"URL":"http:\/\/creativecommons.org\/licenses\/by\/2.0"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Clinical &amp; Translational All"],"published-print":{"date-parts":[[2011,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>For the development of forecasts for seasonal allergic rhinitis symptoms, it is essential to understand the relationship between grass pollen concentrations and the symptoms of grass pollen allergic patients.<\/jats:p><\/jats:sec><jats:sec><jats:title>Objective<\/jats:title><jats:p>The aim of this study was to delineate this relationship between seasonal allergic rhinitis symptoms and grass pollen concentrations in the Netherlands.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Grass pollen allergic patients (n = 80 [2007] \u2010 84 [2008]) were enrolled into the study. They were asked to enter their seasonal allergic rhinitis symptoms (runny nose, sneezing, blocked nose, post nasal drip, and eye symptoms) daily on a scale from 0 to 3 to the study centre either by short message service (SMS) or by internet from May\u2010July 2007 and April\u2010July 2008. Daily pollen counts were used to define the early and the late grass pollen season as the period \u2018before and during\u2019 respectively \u2018after\u2019 the first grass pollen peak (more than 150 pollen\/m<jats:sup>3<\/jats:sup>).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>At similar grass pollen concentrations, the daily mean of the individual maximum symptom scores reported in the early season were higher as compared to that reported in the late season [differences of \u20100.41 (2007) and \u20100.30 (2008)]. This difference could not be explained by medication use by the patients nor by co\u2010sensitization to birch.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusions<\/jats:title><jats:p>We conclude that seasonal allergic rhinitis symptoms at similar grass pollen concentrations are more severe in the early flowering season as compared to those in the late flowering season. This finding is not only relevant for development of forecasts for seasonal allergic rhinitis symptoms but also for understanding symptom development and planning and analysis of clinical studies.<\/jats:p><\/jats:sec>","DOI":"10.1186\/2045-7022-1-18","type":"journal-article","created":{"date-parts":[[2011,12,21]],"date-time":"2011-12-21T19:16:35Z","timestamp":1324494995000},"source":"Crossref","is-referenced-by-count":42,"title":["Difference in symptom severity between early and late grass pollen season in patients with seasonal allergic rhinitis"],"prefix":"10.1002","volume":"1","author":[{"given":"Letty A","family":"de Weger","sequence":"first","affiliation":[{"name":"Department of Pulmonology Leiden University Medical Center Leiden The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thijs","family":"Beerthuizen","sequence":"additional","affiliation":[{"name":"Department of Medical Decision Making Leiden University Medical Center Leiden The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jeannette M","family":"Gast\u2010Strookman","sequence":"additional","affiliation":[{"name":"Department of Pulmonology Leiden University Medical Center Leiden The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dirk T","family":"van der Plas","sequence":"additional","affiliation":[{"name":"Department of Pulmonology Leiden University Medical Center Leiden The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ingrid","family":"Terreehorst","sequence":"additional","affiliation":[{"name":"Department of Pulmonology Leiden University Medical Center Leiden The Netherlands"},{"name":"Department of ENT and Dept of Pediatrics Academic Medical Center Amsterdam The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Pieter S","family":"Hiemstra","sequence":"additional","affiliation":[{"name":"Department of Pulmonology Leiden University Medical Center Leiden The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jacob K","family":"Sont","sequence":"additional","affiliation":[{"name":"Department of Medical Decision Making Leiden University Medical Center Leiden The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"311","published-online":{"date-parts":[[2011,12,21]]},"reference":[{"key":"e_1_2_9_2_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1398-9995.2010.02474.x"},{"key":"e_1_2_9_3_1","doi-asserted-by":"publisher","DOI":"10.1097\/ACI.0b013e32830e6b29"},{"key":"e_1_2_9_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1398-9995.2009.02089.x"},{"key":"e_1_2_9_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1398-9995.2007.01393.x"},{"key":"e_1_2_9_6_1","doi-asserted-by":"publisher","DOI":"10.1159\/000069013"},{"key":"e_1_2_9_7_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1398-9995.1980.tb01810.x"},{"key":"e_1_2_9_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1365-2222.1978.tb00474.x"},{"key":"e_1_2_9_9_1","first-page":"14","article-title":"Content of pollen and spores in the air; 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