Table 1.
Descriptive characteristics [n (%)] of cases and controls identified during follow-up (1986–2006).
| Characteristic | Cases (n = 137) | Controls (n = 863) | p-Valuea | |||
|---|---|---|---|---|---|---|
| Radiation dose, mGy [mean ± SD (range)]b | 132.3 ± 342.6 (0–3220.0) | 81.8 ± 193.7 (0–2600.0) | 0.119c | |||
| Year of birth | 0.988 | |||||
| 1923–1929 | 10 (7) | 67 (8) | ||||
| 1930–1939 | 38 (28) | 222 (26) | ||||
| 1940–1949 | 43 (31) | 285 (33) | ||||
| 1950–1959 | 37 (27) | 234 (27) | ||||
| 1960–1965 | 9 (7) | 55 (6) | ||||
| Areas of study | 0.938 | |||||
| Cherkasy Oblast | 7 (5) | 60 (7) | ||||
| Chernihiv Oblast | 11 (8) | 77 (9) | ||||
| Dnipropetrovsk Oblast | 26 (19) | 155 (18) | ||||
| Kharkiv Oblast | 17 (12) | 107 (12) | ||||
| Kyiv Oblast | 27 (20) | 183 (21) | ||||
| Kyiv City | 49 (36) | 281 (33) | ||||
| Type of residence at time of interview | 0.090 | |||||
| Urban | 101 (74) | 680 (79) | ||||
| Rural | 19 (14) | 151 (18) | ||||
| Other | 10 (7) | 32 (4) | ||||
| Unknown | 7 (5) | 0 (0) | ||||
| Age at first exposure (years) | 0.970 | |||||
| 20–34 | 31 (23) | 207 (24) | ||||
| 35–41 | 36 (26) | 221 (26) | ||||
| 42–49 | 40 (29) | 239 (28) | ||||
| 50–63 | 30 (22) | 196 (23) | ||||
| Education | 0.474 | |||||
| ≤ 8 years | 16 (12) | 131 (15) | ||||
| High school | 46 (34) | 341 (40) | ||||
| Trade school | 34 (25) | 200 (23) | ||||
| College | 34 (25) | 188 (22) | ||||
| Unknown | 7 (5) | 3 (0) | ||||
| Proxy interviews | < 0.001 | |||||
| No | 68 (50) | 820 (95) | ||||
| Yes | 69 (50) | 43 (5) | ||||
| ap-Value from the chi-square test unless otherwise stated. bBone marrow radiation dose lagged by 2 years. cp-Value from the Wilcoxon rank sum test. | ||||||