ABSTRACT
PURPOSE: This cross-sectional study aimed to establish normative values for Sino-Nasal Outcome Test (SNOT-22) score in adult Indian population without known sino-nasal diseases. The purpose was to fill a critical knowledge gap, providing insights into how various host factors influence SNOT-22 scores which seek to serve as reference for clinical studies, facilitating comparisons of symptom severity and aid in patient counselling based on specific score patterns. METHODS: One thousand and twelve adults meeting inclusion criteria participated in the study. Participants provided demographic information, occupation details, addiction history, and medical background. They completed SNOT-22 questionnaire, grading their symptoms on Likert scale of 0-5 based on severity experienced in the past 2 weeks. The collected data were analysed to derive meaningful insights. RESULTS: Mean SNOT-22 score for the study population was 6.80, with 90% scoring below 15, and 40% within 0-3 range. Females exhibited significantly lower mean scores than males. Residents of rural areas reported higher scores than urban counterparts. Education levels had no significant influence on scores. Occupational exposure to aeroallergens, addiction (especially tobacco), and a history of allergies, bronchial asthma, or atopy were associated with significantly higher SNOT-22 scores. Principal component analysis identified four distinct domains, with the nasal symptom domain consistently emerging as the major contributor to differences in subgroups with significantly different total SNOT-22 scores. CONCLUSION: The normative data and subgroup analyses established in this study serve as a foundation for future research, aiding clinicians in predicting symptoms and providing tailored counselling for individuals with sino-nasal pathologies.
