Standardised incidence ratios (SIRs) and 95% confidence intervals (CIs) for cancer of the stomach distal to the cardia among pernicious anaemia patients, stratified by follow up duration and age at index hospitalisation
| Total | Without alcohol related diseases† | |||||
|---|---|---|---|---|---|---|
| Characteristic | Obs* | SIR | 95% CI | Obs* | SIR | 95% CI |
| *Observed number of cancer cases. | ||||||
| †Person years before the onset of comorbid diseases were allocated to the comorbidity negative stratum. | ||||||
| Follow up (y) | ||||||
| 1–4 | 115 | 2.4 | 2.0–2.8 | 113 | 2.4 | 2.0–2.9 |
| 5–9 | 57 | 2.1 | 1.6–2.7 | 55 | 2.1 | 1.6–2.7 |
| ⩾10 | 46 | 2.8 | 2.0–3.7 | 45 | 2.9 | 2.1–3.8 |
| p value for trend | 0.56 | 0.57 | ||||
| Age at index hospitalisation | ||||||
| <50 | 14 | 14.6 | 8.0–24.5 | 14 | 15.7 | 8.6–26.3 |
| 50–69 | 69 | 2.9 | 2.3–3.7 | 66 | 3.0 | 2.3–3.8 |
| ⩾70 | 135 | 2.0 | 1.7–2.4 | 133 | 2.0 | 1.7–2.4 |
| p value for trend | <0.01 | <0.01 | ||||