Table 3.

The sociodemographic and epidemiological characteristics of imported cases and local cases.

Factors	Imported cases		Local cases		χ2-value	P-value
	N=80	Constituent ratio (%)	N=78	Constituent ratio (%)
Sex
Male	53	59.55	36	40.45	6.484	0.011
Female	27	39.13	42	60.87
Age (years)
≤15	2	25.00	6	75.00	4.750	0.191
16~	14	53.85	12	46.15
31~	45	56.96	34	43.04
50~	19	42.22	26	57.78
The time interval from onset to diagnosis (days)
≤4	26	44.83	32	55.17	1.870	0.393
5~	37	56.92	28	43.08
11~21	17	48.57	18	51.43