Table 1.

Descriptive characteristics of study cases and controls.

Characteristics	Cases	Controls	Total
Total	298	1934	2232
Sex
Male	109	700	809
Female	189	1234	1423
Country/Region
Belarus
Gomel	192	1239	1431
Mogilev	36	230	266
Russian Federation
Bryansk	11	74	85
Kaluga	10	60	70
Orel	27	187	214
Tula	22	144	166
Age at exposure, years
<2	89	699	788
2–4	84	520	604
5–9	67	364	431
10–14	44	247	291
15–18	14	104	118