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Table 2 Serum 25(OH)D concentration, daily sun exposure, and occupation according to the recurrence and morphology of pterygium in the Korean population (n = 12,258)

From: Association between pterygium, sun exposure, and serum 25-hydroxyvitamin in a nationally representative sample of Korean adults

  No pterygium Recurrence P No pterygium Morphology P
No recurrence Recurrence Atrophic Intermediate Flesh
Serum 25(OH)D concentration, ng/mL     <.001      < 0.001
 < 15 41.4 (1.1) 27.8 (2.4) 28.7 (3.3)   41.4 (1.1) 25.2 (2.5) 32 (3.7) 30.2 (7.2)  
 15–20 31.3 (0.7) 30.7 (2.4) 33.6 (3.5)   31.3 (0.7) 34.3 (2.5) 26.4 (3.2) 34 (7.2)  
 20–25 16.5 (0.6) 24.1 (2.3) 24.3 (3.6)   16.5 (0.6) 24.6 (2.8) 22.8 (2.6) 26.5 (6.8)  
 25–30 7 (0.4) 11.2 (1.7) 8.3 (2.3)   7 (0.4) 10.5 (2) 11.1 (2.5) 6.1 (3.2)  
 > 30 3.8 (0.4) 6.3 (1.3) 5.1 (1.3)   3.8 (0.4) 5.3 (1.3) 7.6 (1.9) 3.2 (1.9)  
Daily sun exposure, hours     < 0.001      < 0.001
 < 2 60.7 (0.9) 50.3 (3) 38.1 (4.2)   60.7 (0.9) 52.1 (3.1) 45.5 (3.9) 16.8 (4.9)  
 2–5 25.9 (0.8) 21.5 (2.2) 30.2 (3.5)   25.9 (0.8) 17.8 (2.3) 27.5 (3.1) 49.8 (8.6)  
 > 5 13.4 (0.7) 28.3 (2.8) 31.8 (4.1)   13.4 (0.7) 30.1 (3.3) 27 (3.2) 33.4 (7.4)  
Occupation     < 0.001      < 0.001
 1 14.6 (0.5) 2.6 (0.8) 0.9 (0.6)   14.6 (0.5) 2.7 (0.9) 1.5 (0.7) 1.1 (1.1)  
 2 9.5 (0.4) 2.4 (0.8) 4.1 (1.6)   9.5 (0.4) 4.2 (1.2) 1.7 (0.8) .  
 3 14.5 (0.5) 9 (1.8) 6.5 (2)   14.5 (0.5) 9.2 (2) 8.5 (2.1) 0.8 (0.8)  
 4 6.2 (0.7) 24.7 (3) 21.8 (3.7)   6.2 (0.7) 21.8 (3.5) 27 (3.8) 24 (6.5)  
 5 11.9 (0.5) 10.3 (1.7) 10.4 (3.3)   11.9 (0.5) 9.6 (1.7) 11.5 (2.8) 10.4 (6.2)  
 6 8 (0.3) 14.2 (2) 11.1 (2.2)   8 (0.3) 14.1 (2.4) 12.1 (2.4) 13.5 (4.8)  
 7 35.3 (0.6) 36.7 (2.6) 45.2 (4)   35.3 (0.6) 38.5 (3.2) 37.7 (3.7) 50.2 (7.5)  
  1. Numbers are presented as the weighted percentages (SE)
  2. 25(OH)D = 25-hydroxyvitamin D; Occupation, 1 = professional; 2 = office workers; 3 = service industry; 4 = agriculture/forestry/fishery; 5 = technician; 6 = laborer; 7 = none (including housewives, students)