Table 1. The demographic and clinicopathological variables of the 4431 patients.

Variable	No.	0-18 years (%)	19-30 years (%)	31-40 years (%)	41-50 years (%)	51-60 years (%)	61-70 years (%)	71-80 years (%)	81-90 years (%)	P value
Gender										0.586
Male	2406	15 (53.6%)	93 (52.2%)	218 (57.2%)	405 (54.6%)	545 (56.1%)	581 (52.4%)	388 (52.7%)	161 (56.1%)
Female	2025	13 (46.4%)	85 (47.8%)	163 (42.8%)	337 (45.4%)	426 (43.9%)	527 (47.6%)	348 (47.3%)	126 (43.9%)
Ethnicity										0.332
White	3085	19 (67.9)	123 (69.1%)	266 (69.8%)	507 (68.3%)	656 (67.6%)	786 (80.0%)	525 (71.3%)	203 (70.7%)
Black	619	7 (25%)	19 (10.7%)	61 (16%)	114 (15.4%)	147 (15.1%)	139 (12.5%)	93 (12.7%)	39 (13.6%)
Others	703	2 (7.1%)	33 (18.5%)	53 (13.9%)	118 (15.9%)	161 (16.6%)	180 (16.2%)	112 (15.2 %)	44 (15.3%)
Unknown	24	0	3 (1.7%)	1 (0.3%)	3 (0.4%)	7 (0.7%)	3 (0.3%)	6 (0.8%)	1 (0.4%)
Histology										0.771
Thymoma	3512	20 (71.4%)	138 (77.5%)	297 (78.0%)	597 (80.5%)	777 (80.0%)	878 (79.2%)	573 (77.9%)	232 (80.8%)
Type A	211	2	11	19	34	48	38	46	13
Type AB	381	3	13	22	50	106	93	62	32
Type B1	322	2	9	28	50	76	79	57	21
Type B2	321	2	12	37	48	72	75	55	20
Type B3	452	3	21	35	89	93	118	73	20
NOS	1825	8	72	156	326	382	475	280	126
Thymic carcinoma	919	8 (28.6%)	40 (22.5%)	84 (22.0%)	145. (19.5%)	194 (20.0%)	230 (20.8%)	163 (22.1%)	55 (19.2%)
Masaoka-Koga Stage										0.000
I-Iva	2242	10 (35.7%)	74 (41.6%)	174 (45.7%)	351 (47.3%)	477 (49.1%)	627 (56.6%)	384 (52.2%)	145 (50.5%)
IVb	1248	13 (46.4%)	61 (34.3%)	112 (29.4%)	205 (27.6%)	290 (29.9%)	296 (26.7%)	193 (26.2%)	78 (27.2%)
Unknown	941	5 (17.9%)	43 (24.1%)	95 (24.9%)	186 (25.1%)	204 (21.0%)	185 (16.7%)	159 (21.6%)	64 (22.3%)
Surgery										0.860
Yes	2973	22 (78.6%)	115 (64.6%)	266 (69.8%)	494 (66.6%)	655 (67.5%)	732 (66.1%)	504 (68.5%)	185 (64.5%)
No	1384	6 (21.4%)	60 (33.7%)	108 (28.4%)	233 (31.4%)	300 (30.9%)	355 (32.0%)	223 (30.3 %)	99 (34.5%)
unknown	74	0	3 (1.7%)	7 (1.8%)	15 (2.0%)	16 (1.6%)	21 (1.9%)	9 (1.2%)	3 (1.0%)