Outcome of curative resection for perihilar cholangiocarcinoma in Northeast Thailand

Table 5 Bivariate analysis of clinico-pathological parameters

Variable	Number(person-months)	IRR/100	HR	95%CI	P value
Age (10 yr added)	153 (4026.8)	2.96	0.99	(0.97-1.01)	0. 743
Age (yr)					0.003
Less than 70	147 (3984.4)	2.84	1
70 or greater	6 (42.4)	14.15	4.71	(2.02-10.97)
Sex					0.066
Male	113 (2729.4)	3.33	1
Female	40 (1297.4)	2.16	0.68	(0.44-1.04)
Co-morbidity					0.281
Present	32 (1009.3)	2.48	0.79	(0.51-1.23)
Absent	121 (3017.5)	3.12	1
Operation					0.061
Right hepatectomy	63 (1389.1)	3.89	1
Right extended hepatectomy	35 (1059.3)	2.36	0.63	(0.39-1.03)
Left hepatectomy	47 (1412.6)	2.27	0.6	(0.39-0.93)
Bile duct resection	8 (165.8)	4.83	1.12	(0.53-2.36)
Portal vein resection					0.259
Yes	12 (3909.8)	2.92	1.49	(0.77-2.86)
No	141 (117.0)	4.27	1
Residual tumor status					< 0.001
R1	87 (2386.8)	4.63	1
R0	66 (1640.0)	1.8	0.40	(0.27-0.59)
Lymph node metastasis					< 0.001
N1, 2	103 (3248.6)	6.17	1
N0	50 (778.2)	2.19	0.38	(0.26-0.55)
Histology type
Papillary carcinoma	90 (2687.4)	2.38	1		0.012
Others	63 (1339.4)	4.11	1.61	(1.11-2.33)

IRR: Incidence rate per 100 person-months.