Table 1.

Baseline characteristics.

Clinical characteristic	The control group	The observational group	t/x2	P
Mean age (SD),years	38.44 (7.99)	41.02 (8.06)	1.75	P = 0.084 > 0.05
Disease course
≤ 1 month	34	29	0.851	P = 0.653 > 0.05
1–3 months	10	12
> 3 months	15	18
Distributions of the lesions
Left	38	42	0.621	P = 0.431 > 0.05
Right	21	17
Color of discharge
Yellow	42	39	1.072	P = 0.83 > 0.05
Clear	12	16
Milky	3	2
Bloody	2	2