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Table 2 Baseline characteristics of patients with larynx cancer in the original/matched data sets (N = 24,812)

From: Impact of prior cancer history on the survival of patients with larynx cancer

Characteristics Original data set Matched data set
No prior cancer
N = 22,376 (%)
With prior cancer
N = 2436 (%)
P value No prior cancer
N = 2436 (%)
With prior cancer
N = 2436 (%)
P value
Age (years), mean (SD) 63.6 (11.6) 71.3 (10.1) <.001 68.4 (10.0) 71.3 (10.1) 0.025
Year of diagnose(%)    0.001    0.643
 2004–2009 10,484 (46.9) 1056 (43.3)   1040 (42.7) 1056 (43.3)  
 2010–2015 11,892 (53.1) 1380 (56.7)   1396 (57.3) 1380 (56.7)  
Race    0.025    0.069
 White 17,878 (79.9) 1981 (81.3)   2019 (82.9) 1981 (81.3)  
 Black 3495 (15.6) 374 (15.4)   322 (13.2) 374 (15.4)  
 Others/Unknown 1003 (4.5) 81 (3.3)   95 (3.9) 81 (3.3)  
Gender    0.032    0.964
 Male 18,032 (80.6) 2007 (82.4)   2028 (83.3) 2007 (82.4)  
 Female 4344 (19.4) 429 (17.6)   408 (16.7) 429 (17.6)  
Marital status    <.001    0.158
 Single 4511 (20.2) 330 (13.5)   366 (15.0) 330 (13.5)  
 Married 11,093 (49.6) 1309 (53.7)   1260 (51.7) 1309 (53.7)  
 Others status a 5591 (25.0) 641 (26.3)   675 (27.7) 641 (26.3)  
 Unknown 1181 (5.3) 156 (6.4)   135 (5.5) 156 (6.4)  
Grade    0.546    0.170
 Grade I 2992 (13.4) 319 (13.1)   323 (13.3) 319 (13.1)  
 Grade II 10,175 (45.5) 1071 (44.0)   1082 (44.4) 1071 (44.0)  
 Grade III 3919 (17.5) 448 (18.4)   387 (15.9) 448 (18.4)  
 Grade IV 164 (0.7) 17 (0.7)   21 (0.9) 17 (0.7)  
 Unknown 5126 (22.9) 581 (23.9)   623 (25.6) 581 (23.9)  
AJCC stage    <.001    0.402
 I 7257 (32.4) 974 (40.0)   971 (39.9) 974 (40.0)  
 II 3411 (15.2) 347 (14.2)   392 (16.1) 347 (14.2)  
 III 3616 (16.2) 393 (16.1)   365 (15.0) 393 (16.1)  
 IV 6529 (29.2) 537 (22.0)   532 (21.8) 537 (22.0)  
 Unknown 1563 (7.0) 185 (7.6)   176 (7.2) 185 (7.6)  
Surgery    0.012    0.460
 No/unknown 14,355 (64.2) 1500 (61.6)   1525 (62.6) 1500 (61.6)  
 Yes 8021 (35.8) 936 (38.4)   911 (37.4) 936 (38.4)  
Chemotherapy    <.001    0.413
 No/unknown 14,809 (66.2) 1868 (76.7)   804 (33.0) 831 (34.1)  
 Yes 7567 (33.8) 568 (23.3)   1632 (67.0) 1605 (65.9)  
Radiotherapy    <.001    0.683
 No/unknown 5723 (25.6) 831 (34.1)   1880 (77.2) 1868 (76.7)  
 Yes 16,653 (74.4) 1605 (65.9)   556 (22.8) 568 (23.3)  
  1. a other status including divorced, widowed, separated or domestic partner
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