Risk factors, prognostic factors, and nomograms for distant metastasis in patients with diagnosed duodenal cancer: A population-based study

Table 1 Baseline clinical characteristics of duodenal cancer patients, n (%)

	Training (%) (n = 1822)	Validation (n = 781)	Overall (n = 2603)	χ2	P value
Age, yr				0.125	0.939
< 60	625 (34.3)	266 (34.1)	891 (34.2)
> 70	645 (35.4)	282 (36.1)	927 (35.6)
60-70	552 (30.3)	233 (29.8)	785 (30.2)
Race				2.1543	0.3406
Black	358 (19.6)	142 (18.2)	500 (19.2)
Other	166 (9.1)	84 (10.8)	250 (9.6)
White	1298 (71.2)	555 (71.1)	1853 (71.2)
Sex				1.795	0.180
Female	863 (47.4)	393 (50.3)	1256 (48.3)
Male	959 (52.6)	388 (49.7)	1347 (51.7)
Marital status				0.003	0.955
Married	1095 (60.1)	471 (60.3)	1566 (60.2)
Single	727 (39.9)	310 (39.7)	1037 (39.8)
Income				3.034	0.219
$50000- $70000	844 (46.3)	377 (48.3)	1221 (46.9)
< $50000	294 (16.1)	138 (17.7)	432 (16.6)
> $70000	684 (37.5)	266 (34.1)	950 (36.5)
PRCDA				0.635	0.426
No	1338 (73.4)	561 (71.8)	1899 (73.0)
Yes	484 (26.6)	220 (28.2)	704 (27.0)
T				0.092	0.761
T1-T2	943 (51.8)	410 (52.5)	1353 (52.0)
T3-T4	879 (48.2)	371 (47.5)	1250 (48.0)
N				0.160	0.689
N0	1190 (65.3)	503 (64.4)	1693 (65.0)
N1-N2	632 (34.7)	278 (35.6)	910 (35.0)
Grade				1.132	0.568
I	790 (43.3)	354 (45.3)	1144 (43.9)
II	528 (29.0)	212 (27.1)	740 (28.4)
III-IV	504 (27.7)	215 (27.5)	719 (27.6)
Tumor size, mm				0.018	0.894
< 25	868 (47.6)	375 (48.0)	1243 (47.8)
≥ 25	954 (52.4)	406 (52.0)	1360 (52.2)
Histological type				0.010	0.995
Adenocarcinoma	652 (35.8)	281 (36.0)	933 (35.8)
Carcinoid tumor	661 (36.3)	282 (36.1)	943 (36.2)
Other	509 (27.9)	218 (27.9)	727 (27.9

PRCDA: Purchased Referred Care Delivery Area.