Table 2 Standard incidence ratios (SIRs) and 95% confidence intervals (CIs) of laryngeal and pharyngeal cancer in a gastric resection cohort, consisting of 19 767 patients in Sweden during the period 1964–2008
Laryngeal cancer | Pharyngeal cancer | |||||
|---|---|---|---|---|---|---|
Variable | Observed cases ( n) | Expected cases ( n) | SIR (95% CI) | Observed cases ( n) | Expected cases ( n) | SIR (95% CI) |
All | 56 | 28.5 | 2.0 (1.5–2.6) | 28 | 11.7 | 2.4 (1.6–3.5) |
Gender | ||||||
Male | 50 | 26.6 | 1.9 (1.4–2.5) | 25 | 10.0 | 2.5 (1.6–3.7) |
Female | 6 | 1.9 | 3.1 (1.1–6.8) | 3 | 1.7 | 1.7 (0.4–3.3) |
Age (years) | ||||||
<70 | 36 | 14.3 | 2.5 (1.8–3.5) | 13 | 5.9 | 2.2 (1.2–3.8) |
⩾70 | 20 | 14.2 | 1.4 (0.9–2.2) | 15 | 5.8 | 2.6 (1.4–4.3) |
Latency (years) | ||||||
1–10 | 17 | 12.2 | 1.4 (0.8–2.2) | 11 | 5.3 | 2.1 (1.0–3.7) |
11–20 | 21 | 9.6 | 2.2 (1.4–3.4) | 8 | 3.9 | 2.0 (0.9–4.0) |
21–30 | 10 | 5.1 | 2.0 (0.9–3.6) | 3 | 1.9 | 1.6 (0.3–4.5) |
⩾30 | 8 | 1.7 | 4.8 (2.1–9.5) | 6 | 0.6 | 10.2 (3.7–22.3) |
Calendar period | ||||||
1965–1988 | 24 | 14.3 | 1.8 (1.1–2.5) | 10 | 6.2 | 1.6 (0.8–3.0) |
1989–1998 | 19 | 8.7 | 2.2 (1.3–3.4) | 8 | 3.5 | 2.3 (1.0–4.5) |
1999–2008 | 13 | 5.6 | 2.3 (1.2–4.0) | 10 | 2.1 | 4.9 (2.3–8.9) |
