Table 6. Subgroup analyses stratified by TNM stage for surgical patients (OS).

	Stage I	Stage II	Stage III	Stage IV
Marital status
Married	Ref.	Ref.	Ref.	Ref.
Divorced/separated	1.56(1.10, 2.20)b	1.20(0.81, 1.78)	1.22(1.07, 1.39)a	1.15(0.99, 1.35)
Widowed	1.49(1.06, 2.10)b	1.30(0.92, 1.83)	1.07(0.94, 1.23)	1.18(1.00, 1.38)b
Never married	1.45(1.10, 1.92)a	1.49(1.09, 2.03)b	1.03(0.91, 1.16)	1.15(0.99, 1.33)
Age
<60	Ref.	Ref.	Ref.	Ref.
60-69	1.10(0.81, 1.50)	1.10(0.80, 1.51)	1.24(1.12, 1.37)a	1.14(1.01, 1.30)b
70-79	2.49(1.80, 3.44)a	2.06(1.47, 2.88)a	1.66(1.48, 1.87)a	1.20(1.03, 1.39)b
≥80	5.13(3.52, 7.47)a	4.43(3.05, 6.43)a	2.15(1.81, 2.55)a	1.57(1.26, 1.94)a
Race
White	Ref.	Ref.	Ref.	Ref.
Black	1.32(0.89, 1.96)	2.13(1.39, 3.25)a	1.21(1.03, 1.43)b	1.11(0.93, 1.33)
Others	0.80(0.56, 1.14)	0.82(0.54, 1.26)	1.02(0.88, 1.19)	1.01(0.85, 1.21)
Diagnosis year
2004-2008	Ref.	Ref.	Ref.	Ref.
2009-2012	0.84(0.65, 1.08)	1.19(0.92, 1.56)	0.92(0.84, 1.00)	0.94(0.84, 1.05)
Grade
I	Ref.	Ref.	Ref.	Ref.
II	1.41(0.96, 2.06)	1.30(0.73, 2.32)	1.46(1.04, 2.05)b	1.28(0.79, 2.09)
III	1.70(1.15, 2.51)a	1.65(0.95, 2.89)	1.83(1.33, 2.51)a	1.23(0.78, 1.95)
IV	1.49(0.93, 2.39)	1.25(0.68, 2.28)	1.69(1.22, 2.34)a	1.23(0.77, 1.97)
Unknown	1.56(1.03, 2.36) b	1.78(0.99, 3.20)	1.74(1.25, 2.42)a	1.15(0.72, 1.84)
Histological type
Serous	Ref.	Ref.	Ref.	Ref.
Mucinous	0.95(0.66, 1.37)	1.48(0.86, 2.56)	2.55(1.94, 3.34)a	1.97(1.42, 2.74)a
Clear-cell	1.14(0.83, 1.55)	1.18(0.77, 1.79)	1.54(1.25, 1.89)a	1.38(1.05, 1.82)b
Endometrioid	0.57(0.40, 0.81)a	0.69(0.47, 1.00)	0.49(0.38, 0.63)a	0.87(0.65, 1.17)
Others	0.77(0.54, 1.08)	1.17(0.88, 1.57)	1.05(0.93, 1.17)	0.96(0.84, 1.09)

a<0.01; b<0.05.