Table 1.

The demographic characteristics of symptomatic and asymptomatic cases.

Characteristics	Symptomatic Cases (n = 17)	Asymptomatic Cases (n = 24)
Age (years)
Mean ± S.D.	44.9 ± 18.4	27.4 ± 9.6
Median	44	23.5
Sex
Male	64.7% (11)	41.7% (10)
Female	35.3% (6)	58.3% (14)
Smoking habit
Non-smokers	76.5% (13)	95.8% (23)
Smokers	23.5% (4)	4.2% (1)
Source
Mainland	47.1% (8)	29.2% (7)
Overseas	52.9% (9)	70.8% (17)
Been to the epidemic area
Yes	29.4% (5)	41.7% (10)
No	70.6% (12)	58.3% (14)
Exposure to confirmed cases
Yes	29.4% (5)	33.3% (8)
No	70.6% (12)	41.7% (16)