Table 2.
Numbers of stomach cancer over time by subgroups.
| Variable | Person-Years | No. of Stomach Cancer | Rate/10,000 Person-Years (95% CI a) |
|---|---|---|---|
| Age | |||
| <65 | 9,171,234 | 1202 | 1.31 (1.24–1.39) |
| ≥65 | 737,872 | 647 | 8.77 (8.11–9.47) |
| Gender | |||
| Female | 5,024,262 | 715 | 1.42 (1.32–1.53) |
| Male | 4,884,844 | 1134 | 2.32 (2.19–2.46) |
| Urbanization | |||
| Level 1 (high) | 2,944,130 | 519 | 1.76 (1.61–1.92) |
| Level 2 (medium) | 4,247,016 | 796 | 1.87 (1.75–2.01) |
| Level 3 (low) | 2,668,495 | 516 | 1.93 (1.77–2.11) |
| Charlson Comorbidity Index b | |||
| 0–2 | 9,904,066 | 1848 | 1.87 (1.78–1.95) |
| >2 | 5040 | 1 | 1.98 (0.05–11.06) |
| Exposure of talc c | |||
| Unexposed period | 9,728,639 | 1804 | 1.85 (1.77–1.94) |
| Talc-exposed period | 180,467 | 45 | 2.49 (1.82–3.34) |
| Cumulative talc exposure c | |||
| Low to none (≤ 6 g) | 9,774,552 | 1816 | 1.86 (1.77–1.95) |
| Medium (6–21 g) | 87,550 | 23 | 2.63 (1.67–3.94) |
| High (>21 g) | 47,004 | 10 | 2.13 (1.02–3.91) |
a The 95% confidence interval of incidence rate were estimated by the Fisher’s exact test; b The Charlson Comorbidity Index (CCI) was calculated with exclusion of malignancies; c Summary statistics of exposure: median = 10.5 g, first quartile = 6 g, third quartile = 21 g. The exposure of talc was treated as a time-dependent variable.