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Asthma III: Clinical Manifestations01:13

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Asthma presents with a characteristic pattern of episodic respiratory symptoms that reflect underlying airway inflammation, bronchoconstriction, and mucus hypersecretion. Although severity varies among individuals, certain clinical manifestations are considered hallmarks of the disorder and often guide diagnosis and assessment.Respiratory SymptomsA persistent cough is one of the most common early features of asthma. It is frequently dry and tends to worsen at night or in the early morning,...
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The minimally important difference in the Rhinoconjunctivitis Total Symptom Score in grass-pollen-induced allergic

P Devillier1, O Chassany, E Vicaut

  • 1UPRES EA 220, Hôpital Foch, Université Versailles Saint-Quentin, Suresnes, France; Délégation à la Recherche Clinique et à l'Innovation, Unité de Méthodologie, Hôpital Foch, Suresnes, France.

Allergy
|August 27, 2014
PubMed
Summary

The minimally important difference (MID) for the Rhinoconjunctivitis Total Symptom Score (RTSS) in allergic rhinitis was estimated between 1.1 and 1.3. This finding provides a crucial benchmark for assessing symptom improvement in patients with grass-pollen-induced AR.

Keywords:
allergic rhinoconjunctivitisminimally important differencesymptom score

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Area of Science:

  • Allergy and Immunology
  • Clinical Trial Methodology
  • Patient-Reported Outcomes

Background:

  • The minimally important difference (MID) signifies the smallest patient-perceived worthwhile improvement.
  • The MID for the Rhinoconjunctivitis Total Symptom Score (RTSS) has not been previously established.
  • Allergic rhinitis (AR) significantly impacts patient quality of life.

Purpose of the Study:

  • To estimate the MID for the RTSS in patients with grass-pollen-induced AR.
  • To establish a reliable measure for clinically meaningful symptom reduction in AR.
  • To inform clinical practice and research regarding treatment efficacy.

Main Methods:

  • Prospective, multicentre study involving 806 patients with grass-pollen-induced AR.
  • Patients completed daily RTSS, weekly global rating of change scale (GRCS), and Rhinoconjunctivitis Quality of Life Questionnaire (RQLQ) scores.
  • MID was determined using anchor-based methods (GRCS, RQLQ) and distribution-based methods (RTSS standard deviation).

Main Results:

  • Regression analysis indicated MIDs in RTSS ranging from 0.89 to 1.33 across age groups and anchors.
  • Anchor-based MIDs were 1.1-1.3 for adults, 1.2-1.3 for adolescents, and 1.1-1.2 for children.
  • Distribution-based methods yielded MIDs between 1.09 and 1.40.

Conclusions:

  • The MID for the RTSS in grass-pollen-induced AR is consistently estimated between 1.1 and 1.3.
  • This value can be rounded to 1, providing a practical threshold for clinical significance.
  • The findings offer a valuable tool for evaluating treatment effectiveness in AR management.