Table 1 Characteristics of hairy cell leukemia cases and controls.
From: Autoimmune conditions and hairy cell leukemia: an exploratory case-control study
Hairy cell leukemia cases (n = 418) | Controls (n = 160,086) | P-value | |
|---|---|---|---|
Gender | < 0.001 | ||
Male | 285 (68.2%) | 78,620 (49.1%) | |
Female | 133 (31.8%) | 81,466 (50.9%) | |
Age, years | 0.003 | ||
67-69 | 70 (16.8%) | 19,135 (12.0%) | |
70-74 | 122 (29.2%) | 40,611 (25.4%) | |
75-79 | 96 (23.0%) | 41,724 (26.1%) | |
80-84 | 76 (18.2%) | 32,091 (20.1%) | |
85-99 | 54 (12.9%) | 26,902 (16.6%) | |
Selection year | 0.401 | ||
1987-1996 | 203 (48.6%) | 71,396 (44.6%) | |
1997-1999 | 69 (16.5%) | 26,946 (16.8%) | |
2000-2001 | 97 (23.2%) | 40,750 (25.5%) | |
2002 | 49 (11.7%) | 20,994 (13.1%) | |
Race/ethnicity | < 0.001 | ||
White | 390 (93.3%) | 135,280 (84.5%) | |
Black | 10 (2.4%) | 10,897 (6.8%) | |
Asian | 5 (1.2%) | 5,629 (3.5%) | |
Hispanic | < 5 | 3,408 (2.1%) | |
Native American Indian | < 5 | 448 (0.2%) | |
Other/unknown | 8 (1.9%) | 4,424 (2.8%) | |
Duration of Medicare benefits | 177 (42.3%) | 62,264 (38.9%) | 0.359 |
12-57 months | 99 (23.7%) | 36,842 (23.0%) | |
58-93 months | 71 (17.0%) | 30,696 (19.2%) | |
94-136 months | 71 (17.0%) | 30,284 (18.9%) | |
≥137 months | |||
Number of physician claims* | 0.590 | ||
0-20 | 183 (43.8%) | 68,324 (42.7%) | |
21-57 | 80 (19.1%) | 30,532 (19.1%) | |
58-127 | 86 (20.6%) | 30,763 (19.2%) | |
≥128 | 69 (16.5%) | 30,467 (19.0%) | |
Number of outpatient claims* | 0.808 | ||
0 | 166 (39.7%) | 62,453 (39.0%) | |
1-3 | 81 (19.4%) | 32,154 (20.1%) | |
4-7 | 61 (14.6%) | 21,293 (13.3%) | |
8-15 | 56 (13.4%) | 20,722 (12.9%) | |
≥16 | 54 (12.9%) | 23,464 (14.7%) | |
Number of hospital claims* | 0.035 | ||
0 | 235 (56.2%) | 87,059 (54.4%) | |
1 | 90 (21.5%) | 28,505 (17.8%) | |
2-3 | 49 (11.7%) | 25,255 (15.7%) | |
≥4 | 44 (10.5%) | 19,267 (12.0%) |