Table 1.

Clinical characteristics of patients by timing of CIN in patients with serous ovarian cancer(n = 169)

Variables	n	Early onset	Non-early onset	P value
Age (year)				0.839
<50	75	49	26
≥ 50	94	60	34
FIGO stage				0.462
I-II	45	27	18
III-IV	124	82	42
Histological grade				0.128
Low	42	23	19
High	127	86	41
Lymph node invasion				0.133
Negative	132	89	43
Positive	37	20	17
Tumor residual (cm)				0.058
Optimal(≤1)	127	87	40
Sub-optimal(>1)	42	22	20
CA125 level (U/mL)				0.634
≤ 35	12	9	3
>35	157	100	57
Severity of CIN				<0.001
Absence	16	0	16
Mild	115	83	32
Sever	38	26	12