Table 1.

Baseline characteristics of input features

Type	Variables	N (total = 149,471)	%
Basic information	Sex
	Male	75,073	50.23
	Female	74,398	49.77
	Age	Mean = 44.36 (std = 20.27)
	Area of residence
	Latitude	Mean = 36.93 (std = 0.93)
	Longitude	Mean = 127.39 (std = 0.76)
	Body temperature (T, °C)
	T ≤ 36.5	121,557	81.32
	36.5 < T < 37.5	6310	4.22
	37.5 ≤ T < 38.3	17,227	11.53
	T ≥ 38.3	4377	2.93
Respiratory symptom	Cough
	True	34,201	22.88
	False	99,997	66.90
	Sputum
	True	17,108	11.45
	False	117,090	78.34
	Sore throat
	True	25,078	16.78
	False	109,120	73.00
	Dyspnea
	True	1962	1.31
	False	132,236	88.47
Non-respiratory symptom	Musculoskeletal pain
	True	24,017	16.07
	False	110,181	73.71
	Headache
	True	16,337	10.93
	False	117,861	78.85
	Chill
	True	17,227	11.53
	False	116,971	78.26
	Ageusia
	True	4846	3.24
	False	129,352	86.54
	Anosmia
	True	5498	3.68
	False	128,700	86.10