Table 1. Summary of clinical manifestations and past medical history of participants .

Clinical manifestation	No.	%
Flu or cold symptoms before anosmia	7608	75.56%
Headache (which needed pain reliever drug)	4903	48.69%
Nasal stiffness	4400	43.70%
Fever and chills	3764	37.38%
Sore throat	1948	19.35%
Prominent cough	1911	18.98%
Orbital (periorbital) pain	1898	18.85%
Facial fullness and sinus pain	1864	18.51%
Rhinorrhea	1574	15.63%
Dyspnea	1448	14.38%
Nasal irritation	1380	13.71%
Parosmia	1287	12.78%
Nasal pruritus	1083	10.76%
Otalgia	999	9.92%
Sneezing frequent	914	9.08%
Purulent nasal discharge	879	8.73%
Cheeks pain	452	4.49%
Unilateral facial palsy	52	0.52%
Past medical history
History of hypothyroidism	1077	10.70%
History of asthma	612	6.08%
History of hypertension	428	4.25%
Previous sinus surgery or septorhinoplasty	266	2.64%
History of diabetes mellitus	199	1.98%
History of hyperthyroidism	158	1.57%
History of epilepsy	47	0.47%

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