Table 3.
ORs and 95%CIs of gastric cancer by tertiles of dietary vitamin C
| Range (mg/d) | No. of controls/cases | Model I OR (95%CI) | Model II OR (95%CI) | Model III OR (95%CI) | |
| Total (n = 1245) | |||||
| T1 | < 80.14 | 276/186 | 1 | 1 | 1 |
| T2 | 80.14-120.67 | 277/130 | 0.70 (0.53-0.92) | 0.81 (0.59-1.10) | 0.81 (0.58-1.12) |
| T3 | ≥ 120.67 | 277/99 | 0.53 (0.40-0.71) | 0.64 (0.46-0.88) | 0.71 (0.50-1.00) |
| P for trend1 | < 0.001 | 0.007 | 0.052 | ||
| Men (n = 810) | |||||
| T1 | < 73.18 | 180/107 | 1 | 1 | 1 |
| T2 | 73.18-110.59 | 180/93 | 0.87 (0.62-1.23) | 1.11 (0.75-1.64) | 1.07 (0.70-1.61) |
| T3 | ≥ 110.59 | 180/70 | 0.65 (0.45-0.94) | 0.78 (0.52-1.18) | 0.91 (0.59-1.41) |
| P for trend | 0.022 | 0.229 | 0.659 | ||
| Women (n = 435) | |||||
| T1 | < 91.70 | 96/69 | 1 | 1 | 1 |
| T2 | 91.70-139.52 | 97/45 | 0.65 (0.40-1.03) | 0.81 (0.48-1.36) | 0.85 (0.49-1.48) |
| T3 | ≥ 139.52 | 97/31 | 0.45 (0.27-0.74) | 0.57 (0.32-1.00) | 0.61 (0.34-1.12) |
| P for trend | 0.002 | 0.051 | 0.109 | ||
1
Trends were calculated using the median intake for each dietary vitamin C category as a continuous variable: Model I: Unadjusted; Model II: Adjusted by first-degree family history of gastric cancer, education level, job, household income, smoking status, regular exercise; Model III: Additionally adjusted for H. pylori infection.