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Table 2 The characteristics of patients between the training cohort and the validation cohort

From: Comparing the characteristics and predicting the survival of patients with head and neck melanoma versus body melanoma: a population-based study

 

the HNM group

the BM group

Training cohort (%)

Validation cohort (%)

P value

Training cohort (%)

Validation cohort (%)

P value

Total

10,551 (70.0)

4520 (30.0)

 

38,876 (70.0)

16,658 (30.0)

 

Age

  

0.21

  

0.748

  ≤ 58

3349 (31.7)

1467 (32.5)

 

20,275 (52.2)

8666 (52.0)

 

 59–78

4885 (46.3)

2023 (44.8)

 

14,790 (38.0)

6324 (38.0)

 

  ≥ 79

2317 (22.0)

1030 (22.8)

 

3811 (9.8)

1668 (10.0)

 

Sex

  

0.62

  

0.836

 Male

7653 (72.5)

3260 (72.1)

 

20,359 (52.4)

8707 (52.3)

 

 Female

2898 (27.5)

1260 (27.9)

 

18,517 (47.6)

7951 (47.7)

 

Race

  

0.911

  

0.31

 White

10,452 (99.1)

4476 (99.0)

 

38,267 (98.4)

16,417 (98.6)

 

 aOthers

99 (0.9)

44 (1.0)

 

609 (1.6)

241 (1.4)

 

Histology

  

0.31

  

0.067

 NM

1680 (15.9)

672 (14.9)

 

5448 (14.0)

2457 (14.7)

 

 LMM

3328 (31.5)

1470 (32.5)

 

2589 (6.7)

1049 (6.3)

 

 SMM

4306 (40.8)

1862 (41.2)

 

27,177 (69.9)

11,571 (69.5)

 

 bOther Melanoma

1237 (11.7)

516 (11.4)

 

3662 (9.4)

1581 (9.5)

 

Thickness

  

0.096

  

0.012

  < 0.6 mm

4691 (44.5)

2026 (44.8)

 

17,866 (46.0)

7435 (44.6)

 

 0.6–0.79 mm

987 (9.4)

466 (10.3)

 

4711 (12.1)

2061 (12.4)

 

 0.8–1.0 mm

827 (7.8)

321 (7.1)

 

3699 (9.5)

1527 (9.2)

 

 1.01–2.0 mm

1666 (15.8)

728 (16.1)

 

6073 (15.6)

2673 (16.0)

 

 2.01–4.0 mm

1268 (12.0)

491 (10.9)

 

3666 (9.4)

1671 (10.0)

 

  > 4.0 mm

1112 (10.5)

488 (10.8)

 

2861 (7.4)

1291 (7.8)

 

Ulceration

  

0.459

  

0.43

 No

8841 (83.8)

3810 (84.3)

 

33,040 (85.0)

14,113 (84.7)

 

 Yes

1710 (16.2)

710 (15.7)

 

5836 (15.0)

2545 (15.3)

 

Stage

  

0.795

  

0.159

 Localized

9051 (85.8)

3893 (86.1)

 

34,591 (89.0)

14,729 (88.4)

 

 Regional

1320 (12.5)

548 (12.1)

 

3731 (9.6)

1677 (10.1)

 

 Distant

180 (1.7)

79 (1.7)

 

554 (1.4)

252 (1.5)

 

Metastases

  

0.937

  

0.251

 No

10,405 (98.6)

4456 (98.6)

 

38,501 (99.0)

16,479 (98.9)

 

 Yes

146 (1.4)

64 (1.4)

 

375 (1.0)

179 (1.1)

 

Surgery

  

0.545

  

0.591

 No

245 (2.3)

97 (2.1)

 

773 (2.0)

319 (1.9)

 

 Yes

10,306 (97.7)

4423 (97.9)

 

38,103 (98.0)

16,339 (98.1)

 
  1. HNM head and neck melanoma, BM body melanoma, NM nodular melanoma, LMM Lentigo maligna melanoma, SSM superficial spreading melanoma
  2. a Others = black, Asian or pacific islander, American indian/Alaska native
  3. b Other melanoma: International Classification of Diseases for Oncology-O-3, codes 8722–8723, 8730, 8740–8741, 8744–8746, 8761, 8770–8774, 8780
  4. P values were obtained using the Pearson χ2 test or Fisher exact test. Bold values indicate statistical significance less than 0.05
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BMC Cancer

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