TY - JOUR
T1 - Psychometric and Clinimetric Validity of the Modified 25-Item Sino-Nasal Outcome Test
AU - Tait, Sarah D.
AU - Kallogjeri, Dorina
AU - Chidambaram, Smrithi
AU - Schneider, John
AU - Piccirillo, Jay F.
N1 - Publisher Copyright:
© The Author(s) 2019.
PY - 2019/9/1
Y1 - 2019/9/1
N2 - Background: Productivity losses are a significant part of the disease burden associated with rhinosinusitis, but existing measures of disease-specific quality of life exclude explicit assessment of the impact of the disease on productivity. Objective: The objective of this study was to evaluate the clinimetric and psychometric validity of the 25-item Sino-Nasal Outcome Test (SNOT-25), a modified version of the SNOT-22. Methods: This was a prospective cohort study conducted at an academic medical center. Participants included adult patients with rhinosinusitis who presented for routine visits to the Washington University in St. Louis School of Medicine otolaryngology clinic between August 2016 and March 2017. Results: The SNOT-25 was created with the addition of three productivity-specific items to the SNOT-22 instrument. A total of 120 rhinosinusitis patients completed all baseline measurements and 94 (78.3%) completed 3-month follow-up. The Cronbach’s α was 0.83, indicating high internal consistency. Rhinosinusitis patients had on average a 24-point higher baseline SNOT-25 score (95% confidence interval [CI]: 13–35) as compared to healthy controls indicating good discriminative validity. There was high correlation between SNOT-25 scores at 3 months and 3.5 months (r =.81; 95% CI, 0.73–0.87) confirming strong test–retest reliability. SNOT-25 had a strong correlation with the overall score of the Nasal Obstruction Symptom Evaluation instrument (r =.55; 95% CI, 0.42–0.65), and among Short Form-36 subscales, the strongest correlations existed between SNOT-25 and the fatigue scale (r = −.522; 95% CI, −0.63 to −0.39). Exploratory factor analysis revealed that the 3 new questions of SNOT-25 loaded together with reduction in productivity and concentration items on a new “productivity” factor. Conclusion: The SNOT-25 is a valid instrument that can be used to assess rhinosinusitis disease burden including the impact on productivity and may be a better predictor of treatment decisions and outcomes.
AB - Background: Productivity losses are a significant part of the disease burden associated with rhinosinusitis, but existing measures of disease-specific quality of life exclude explicit assessment of the impact of the disease on productivity. Objective: The objective of this study was to evaluate the clinimetric and psychometric validity of the 25-item Sino-Nasal Outcome Test (SNOT-25), a modified version of the SNOT-22. Methods: This was a prospective cohort study conducted at an academic medical center. Participants included adult patients with rhinosinusitis who presented for routine visits to the Washington University in St. Louis School of Medicine otolaryngology clinic between August 2016 and March 2017. Results: The SNOT-25 was created with the addition of three productivity-specific items to the SNOT-22 instrument. A total of 120 rhinosinusitis patients completed all baseline measurements and 94 (78.3%) completed 3-month follow-up. The Cronbach’s α was 0.83, indicating high internal consistency. Rhinosinusitis patients had on average a 24-point higher baseline SNOT-25 score (95% confidence interval [CI]: 13–35) as compared to healthy controls indicating good discriminative validity. There was high correlation between SNOT-25 scores at 3 months and 3.5 months (r =.81; 95% CI, 0.73–0.87) confirming strong test–retest reliability. SNOT-25 had a strong correlation with the overall score of the Nasal Obstruction Symptom Evaluation instrument (r =.55; 95% CI, 0.42–0.65), and among Short Form-36 subscales, the strongest correlations existed between SNOT-25 and the fatigue scale (r = −.522; 95% CI, −0.63 to −0.39). Exploratory factor analysis revealed that the 3 new questions of SNOT-25 loaded together with reduction in productivity and concentration items on a new “productivity” factor. Conclusion: The SNOT-25 is a valid instrument that can be used to assess rhinosinusitis disease burden including the impact on productivity and may be a better predictor of treatment decisions and outcomes.
KW - 25-item Sino-Nasal Outcome Test
KW - absenteeism
KW - clinimetric validity
KW - disease burden
KW - presenteeism
KW - productivity
KW - psychometric validity
KW - quality of life
KW - rhinosinusitis
KW - sino-nasal
UR - http://www.scopus.com/inward/record.url?scp=85066859085&partnerID=8YFLogxK
U2 - 10.1177/1945892419851622
DO - 10.1177/1945892419851622
M3 - Article
C2 - 31134810
AN - SCOPUS:85066859085
SN - 1945-8924
VL - 33
SP - 577
EP - 585
JO - American Journal of Rhinology and Allergy
JF - American Journal of Rhinology and Allergy
IS - 5
ER -