Table 2.

Prognostic factors for T1 PAAD patients. HR: hazard ratio. CI: confidence interval

	Univariate analysis							Multivariate analysis
					95%CI							95%CI
	Standard error	Wald chi-square	P	HR	Down	Up		Standard error	Wald chi-square	P	HR	Down	Up
Year of diagnosis							Year of diagnosis
2004–2008	Reference						2004–2008	Reference
2009–2014	0.12	18.96	< 0.001	0.60	0.47	0.75	2009–2014	0.12	18.62	< 0.001	0.60	0.47	0.76
Race							Race
White	Reference						White
Yellow	0.22	0.99	0.32	0.81	0.53	1.23	Yellow
Black	0.18	0.07	0.79	1.05	0.73	1.51	Black
Others	0.71	0.43	0.51	0.63	0.16	2.53	Others
Age	0.01	0.11	0.74	1.00	0.99	1.01	Age
Gender							Gender
Male	Reference						Male
Female	0.12	1.66	0.20	0.86	0.68	1.08	Female
Marital status							Marital status
Married	Reference						Married
Single	0.23	2.50	0.11	0.70	0.45	1.09	Single
Divorced	0.21	0.11	0.74	0.93	0.62	1.41	Divorced
Widowed	0.16	1.22	0.27	1.19	0.87	1.62	Widowed
Unknown	0.34	0.14	0.71	0.88	0.45	1.72	Unknown
Size	0.02	8.89	0.003	1.05	1.02	1.08	Size
N stage							N stage
N0	Reference						N0	Reference
N1	0.13	26.95	< 0.001	1.92	1.50	2.45	N1	0.13	17.52	< 0.001	1.71	1.33	2.19
N2	0.23	12.17	< 0.001	2.22	1.42	3.47	N2	0.23	11.28	0.001	2.17	1.38	3.40
Site							Site
Head	Reference						Head	Reference
Body/Tail	0.15	8.55	0.003	0.65	0.49	0.87	Body/Tail	0.15	6.18	0.01	0.69	0.52	0.93
Pathology grade							Pathology grade
Grade 1	Reference						Grade 1	Reference
Grade 2	0.17	1.96	0.16	1.28	0.91	1.79	Grade 2	0.18	1.17	0.28	1.21	0.86	1.70
Grade 3	0.19	9.06	0.003	1.79	1.23	2.62	Grade 3	0.20	7.19	0.01	1.70	1.15	2.50
Grade 4	0.60	0.85	0.36	1.73	0.54	5.60	Grade 4	0.60	0.72	0.40	1.66	0.51	5.37
Unknown	0.28	0.42	0.52	1.20	0.69	2.09	Unknown	0.28	0.55	0.46	1.23	0.71	2.15