Table 4. The subgroup analyses for patients with HBsAg negative: univariate logistic regression analyses.
| Variable | Gastric cancer group (n=480) No. (%) | Control group (n=510) No. (%) | OR | 95% CI | P-value |
|---|---|---|---|---|---|
| ABO blood group (A/B/AB/O) | 0.59 | ||||
| O | 189 (40.3) | 214 (42.3) | 1 | Reference | |
| A | 135 (28.8) | 132 (26.1) | 1.16 | 0.85–1.58 | 0.35 |
| B | 112 (23.9) | 131 (25.9) | 0.97 | 0.70–1.33 | 0.84 |
| AB | 33 (7.0) | 29 (5.7) | 1.29 | 0.75–2.20 | 9.35 |
| History of chronic gastritis (no/yes) | 414/66 (86.3/13.8) | 491/19 (96.3/3.7) | 4.12 | 2.43–6.98 | <0.001 |
| Family history of gastric cancer (no/yes) | 451/29 (94.0/6.0) | 506/4 (99.2/0.8) | 8.13 | 2.84–23.32 | <0.001 |
| Smoking (never/past and/or current) | 311/166 (65.2/34.8) | 317/193 (62.2/37.8) | 0.88 | 0.68–1.14 | 0.32 |
| Alcohol consumption (never/past and/or current) | 397/80 (83.2/16.8) | 430/80 (84.3/15.7) | 1.08 | 0.77–1.52 | 0.64 |
| History of diabetes mellitus (no/yes) | 444/36 (92.5/7.5) | 483/27 (94.7/5.3) | 1.45 | 0.87–2.43 | 0.16 |
| HBsAg negative (A) | 0.12 | ||||
| HBsAg negative and anti-HBc negative and anti-HBs negative | 105 (21.9) | 111 (21.8) | 1 | Reference | |
| HBsAg negative and anti-HBc negative and anti-HBs positive | 231 (48.1) | 241 (47.3) | 1.01 | 0.73–1.40 | 0.93 |
| HBsAg negative and anti-HBc positive and anti-HBs negative | 51 (10.6) | 36 (7.1) | 1.50 | 0.91–2.48 | 0.12 |
| HBsAg negative and anti-HBc positive and anti-HBs positive | 93 (19.4) | 122 (23.9) | 0.81 | 0.55–1.18 | 0.27 |
| HBsAg negative (B) | 0.12 | ||||
| HBsAg negative and anti-HBc positive and anti-HBs negative | 51 (10.6) | 36 (7.1) | 1 | Reference | |
| HBsAg negative and anti-HBc negative and anti-HBs positive | 231 (48.1) | 241 (47.3) | 0.68 | 0.43–1.08 | 0.10 |
| HBsAg negative and anti-HBc positive and anti-HBs positive | 93 (19.4) | 122 (23.9) | 0.54 | 0.33–0.89 | 0.02 |
| HBsAg negative and anti-HBc negative and anti-HBs negative | 105 (21.9) | 111 (21.8) | 0.67 | 0.40–1.10 | 0.12 |
Abbreviations: anti-HBc=antibody to hepatitis B core antigen; anti-HBs=antibody to hepatitis B surface antigen; CI=confidence interval; HBsAg=hepatitis B surface antigen; OR=odds ratio.