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Table 1 Baseline characteristics of subjects

From: Prevalence and risk factors of Helicobacter pylori infection in Korea: Nationwide multicenter study over 13 years

  Subjects without GI operation history Subjects without history of H. pylorieradication Asymptomatic subjects without history of H. pylorieradication
n (%) n (%) n (%)
Total   19,272 (100.0) 15,560 (100.0) 10,796 (100.0)
Sex Male 10,557 (54.8) 8,311 (53.4) 6,085 (56.4)
Female 8,715 (45.2) 7,249 (46.6) 4,711 (43.6)
  Subtotal 19,272 (100.0) 15,560 (100.0) 10,796 (100.0)
Age (years) 16-19 34 (0.2) 33 (0.2) 17 (0.2)
20-29 798 (4.1) 777 (5.0) 421 (3.9)
30-39 2,853 (14.8) 2,607 (16.8) 1,659 (15.4)
40-49 5,087 (26.4) 4,198 (27.0) 2,913 (27.0)
50-59 6,176 (32.0) 4,709 (30.3) 3,403 (31.5)
60-69 3,358 (17.4) 2,493 (16.0) 1,840 (17.0)
≥70 966 (5.0) 743 (4.8) 543 (5.0)
Subtotal 19,272 (100.0) 15,560 (100.0) 10,796 (100.0)
Geographic area Seoul 10,755 (55.8) 8,515 (54.8) 5,829 (54.0)
Gyeonggi 3,025 (15.7) 2,403 (15.5) 1,683 (15.6)
Chungcheong 863 (4.5) 740 (4.8) 536 (5.0)
Kyungsang 1,630 (8.5) 1,313 (8.4) 914 (8.5)
Cholla 1,807 (9.4) 1,553 (10.0) 1,194 (11.1)
Kangwon 588 (3.1) 466 (3.0) 331 (3.1)
Jeju 589 (3.1) 555 (3.6) 299 (2.8)
Subtotal* 19,257 (100.0) 15,545 (100.0) 10,786 (100.0)
Household income** low 2,114 (12.5) 1,838 (13.5) 1,247 (13.2)
medium 11,049 (65.2) 8,843 (65.1) 6,197 (65.6)
high 3,781 (22.3) 2,910 (21.4) 2,005 (21.2)
Subtotal* 16,944 (100.0) 13,591 (100.0) 9,449 (100.0)
Education level*** low 1,743 (9.5) 1,458 (9.9) 984 (9.7)
medium 3,667 (20.0) 3,004 (20.4) 1,981 (19.4)
high 12,928 (70.5) 10,250 (69.7) 7,223 (70.9)
Subtotal* 18,338 (100.0) 14,712 (100.0) 10,188 (100.0)
Body mass index (kg/m2) <18.5 840 (4.4) 736 (4.8) 412 (3.9)
18.5 - <23.0 7,696 (40.6) 6,245 (40.7) 4,237 (39.8)
23.0 - <25.0 4,818 (25.4) 3,821 (24.9) 2,759 (25.9)
≥25.0 5,625 (29.6) 4,530 (29.5) 3,249 (30.5)
Subtotal* 18,979 (100.0) 15,332 (100.0) 10,657 (100.0)
Cholesterol (mg/dl) <240 16,671 (90.5) 13,417 (90.4) 9,228 (90.1)
≥240 1,755 (9.5) 1,428 (9.6) 1,013 (9.9)
Subtotal* 18,426 (100.0) 14,845 (100.0) 10,241 (100.0)
TG (mg/dl) <150 14,651 (79.7) 11,873 (80.1) 8,118 (79.4)
≥150 3,736 (20.3) 2,941 (19.9) 2,102 (20.6)
Subtotal* 18,387 (100.0) 14,814 (100.0) 10,220 (100.0)
Glucose (mg/dl) <100 12,999 (70.7) 10,667 (72.0) 7,206 (70.5)
100 - <126 4,438 (24.1) 3,399 (22.9) 2,459 (24.1)
≥126 955 (5.2) 747 (5.0) 555 (5.4)
Subtotal* 18,392 (100.0) 14,813 (100.0) 10,220 (100.0)
Family history of gastric cancer No 16,470 (86.6) 13,418 (87.5) 9,473 (88.2)
Yes 2,556 (13.4) 1,910 (12.5) 1,270 (11.8)
Subtotal* 19,026 (100.0) 15,328 (100.0) 10,743 (100.0)
GI symptoms No 13,121 (68.8) 10,796 (70.3)   
Yes 5,954 (31.2) 4,568 (29.7)   
Subtotal* 19,075 (100.0) 15,364 (100.0)   
  1. *Subjects with missing values were excluded.
  2. **Household income was classified as low (less than US $ 3,000), medium (US $ 3,000 to 10,000), or high (more than US $ 10,000).
  3. ***Education level was classified as low (middle school graduates or less), middle (high school graduates or university dropouts), or high (university graduates or graduates of a postgraduate course).
  4. GI gastrointestinal.