Table 7.
Observed and fitteda cancers of the stomach by dose category for various risk factors
| Dose (Gy) | People | Person yearsb | Cases | Backgroundc | Radiationd | Smokingb |
|---|---|---|---|---|---|---|
|
| ||||||
| < 0.005 | 60,983 | 1,787,606 | 3,156 | 2,923.3 | 0.6 | 253.0 |
| − 0.1 | 27,536 | 808,203 | 1,490 | 1,291.2 | 16.6 | 133.9 |
| −0.2 | 5,584 | 163,606 | 301 | 272.1 | 15.8 | 28.1 |
| − 0.5 | 5,931 | 169,815 | 340 | 281.3 | 37.1 | 30.3 |
| − 1 | 3,216 | 90,718 | 205 | 147.8 | 42.5 | 16.5 |
| − 2 | 1,628 | 44,903 | 118 | 72.2 | 39.8 | 9.5 |
| 2+ | 566 | 14,642 | 51 | 21.2 | 25.8 | 2.7 |
|
| ||||||
| Total | 105,444 | 3,079,492 | 5,661 | 5,009.1 | 178.1 | 473.8 |
a
Fitted cases were based on multiplicative models for the joint effects of radiation and smoking on the risk of cancers of the stomach.
b
The person-years and fitted cases showed were rounded; the sum of the numeric totals does not necessarily equal the total in lowest row.
c
Background cases are estimates of the expected number of cases among non-smoking cohort members with no radiation exposure.
d
The excess cases for radiation include cases associated with the interaction between radiation and smoking.