Table 3. The comparison of baseline data by the chi-squared test.

	Gender		Fever		Three-concave sign		Abnormal chest X-ray		Antibiotics usage in treatment
	M	F	Yes	No	Yes	No	Yes	No	Yes	No
IFN Injection	97	53	44	106	40	110	127	23	39	111
Control	104	46	51	99	31	119	128	22	44	106
IFN Nebulization 1	111	39	59	91	57	93	140	10	37	113
IFN Nebulization 2	95	55	50	100	31	119	128	22	43	107
χ2	4.850		3.387		15.428		6.839		1.103
P	0.183		0.336		0.001		0.077		0.776