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Table 1 Characteristics of samples included in this study

From: Skin pigmentation polymorphisms associated with increased risk of melanoma in a case-control sample from southern Brazil

  Global
n = 255 (%)
Cases
n = 120 (%)
Controls
n = 135 (%)
P
Sex
 Female 157 (61.6) 73 (60.8) 84 (62.2) 0.461
Agea
 ≥ 50 years old 180 (70.6) 78 (65) 102 (75.6)  
 < 50 years old 75 (29.4) 42 (35) 33 (24.4) 0.012
Mean ages (SD) 57.01 56.31 (15.5) 58.28 (13.7)  
Skin type
 I 9 (3.5) 7 (5.8) 2 (1.5)  
 II 136 (53.3) 66 (55) 70 (51.8)  
 III 100 (39.2) 42 (35) 58 (43)  
 IV 7 (2.7) 4 (3.3) 3 (2.2)  
 V 3 (1.2) 1 (0.8) 2 (1.5) 0.281
Hair color
 Blond 52 (20.4) 30 (25) 22 (16.3)  
 Red 11 (4.3) 9 (7.5) 2 (1.5)  
 Light Brown 82 (32.1) 39 (32.5) 43 (31.8)  
 Dark Brown 89 (35) 32 (26.7) 57 (42.2)  
 Black 21 (8.2) 10 (8.3) 11 (8.1) 0.017
Eyes color
 Blue 70 (28.1) 39 (33.3) 31 (23.5)  
 Green 47 (18.9) 27 (23) 20 (15.1)  
 Brown 131 (52.6) 51 (43.6) 80 (60.6)  
 Black 1 (0.4) 0 1 (0.7) 0.074
Number of nevi
 ≥ 50 41 (16.5) 33 (28.2) 8 (6.1)  
 < 50 207 (83.5) 84 (71.8) 123 (93.9) 0.000
Number of dysplasic nevi
 ≥ 5 17 (6.8) 15 (12.8) 2 (1.5)  
 < 4 231 (93.1) 102 (87.1) 129 (98.5) 0.000
Ancestry profileb
 European 0.971 0.945 0.911 0.004
 African 0.010 0.022 0.039 0.008
 Native-American 0.013 0.032 0.048 0.388
  1. Abbreviation: SD standard deviation
  2. aSamples age at recruitment
  3. bAncestrality profiles obtained for Ancestral Informative Markers (AIMs) indels panel. Date presented as median of percentile ancestry component
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