Baseline characteristics of the study population
| Variable . | HTLV-I, n (%) . | HTLV-II, n (%) . | Controls, n (%) . |
|---|---|---|---|
| Participants | 152 (11) | 387 (29) | 797 (60) |
| Blood center | |||
| ARC Chesapeake | 31 (20) | 51 (13) | 121 (15) |
| ARC SE Michigan | 32 (21) | 38 (10) | 101 (13) |
| ARC Southern California | 43 (28) | 205 (53) | 344 (43) |
| BCP | 30 (20) | 70 (18) | 157 (20) |
| OBI Oklahoma | 16 (11) | 23 (6) | 74 (9) |
| Sex | |||
| Male | 44 (29) | 102 (26) | 257 (32) |
| Female | 108 (71) | 285 (74) | 540 (68) |
| Age, y | |||
| < 30 | 12 (8) | 28 (7) | 77 (10) |
| 30-39 | 30 (20) | 165 (43) | 248 (31) |
| 40-49 | 65 (43) | 129 (33) | 260 (33) |
| 50-59 | 22 (14) | 44 (11) | 128 (16) |
| ≥ 60 | 23 (15) | 21 (5) | 84 (11) |
| Race/ethnicity | |||
| White | 62 (41) | 162 (42) | 370 (46) |
| Black | 60 (39) | 124 (32) | 242 (30) |
| Hispanic | 5 (3) | 76 (20) | 85 (11) |
| Asian | 20 (13) | 6 (2) | 50 (6) |
| Other | 3 (2) | 10 (3) | 39 (5) |
| Unknown | 2 (1) | 9 (2) | 11 (1) |
| Education | |||
| High school or less | 53 (35) | 154 (40) | 146 (18) |
| Some college | 62 (41) | 176 (45) | 357 (45) |
| College | 36 (24) | 53 (14) | 289 (36) |
| Unknown | 1 (1) | 4 (1) | 5 (1) |
| Annual income | |||
| ≤ $30 000 | 57 (38) | 168 (43) | 200 (25) |
| $30 001 to $49 999 | 46 (30) | 121 (31) | 242 (30) |
| ≥ $50 000 | 46 (30) | 91 (24) | 343 (43) |
| Unknown | 3 (2) | 7 (2) | 12 (2) |
| Injection drug use | |||
| Never | 149 (98) | 294 (76) | 786 (99) |
| Ever | 2 (1) | 92 (24) | 10 (1) |
| Missing | 1 (1) | 1 (0) | 1 (0) |
| Variable . | HTLV-I, n (%) . | HTLV-II, n (%) . | Controls, n (%) . |
|---|---|---|---|
| Participants | 152 (11) | 387 (29) | 797 (60) |
| Blood center | |||
| ARC Chesapeake | 31 (20) | 51 (13) | 121 (15) |
| ARC SE Michigan | 32 (21) | 38 (10) | 101 (13) |
| ARC Southern California | 43 (28) | 205 (53) | 344 (43) |
| BCP | 30 (20) | 70 (18) | 157 (20) |
| OBI Oklahoma | 16 (11) | 23 (6) | 74 (9) |
| Sex | |||
| Male | 44 (29) | 102 (26) | 257 (32) |
| Female | 108 (71) | 285 (74) | 540 (68) |
| Age, y | |||
| < 30 | 12 (8) | 28 (7) | 77 (10) |
| 30-39 | 30 (20) | 165 (43) | 248 (31) |
| 40-49 | 65 (43) | 129 (33) | 260 (33) |
| 50-59 | 22 (14) | 44 (11) | 128 (16) |
| ≥ 60 | 23 (15) | 21 (5) | 84 (11) |
| Race/ethnicity | |||
| White | 62 (41) | 162 (42) | 370 (46) |
| Black | 60 (39) | 124 (32) | 242 (30) |
| Hispanic | 5 (3) | 76 (20) | 85 (11) |
| Asian | 20 (13) | 6 (2) | 50 (6) |
| Other | 3 (2) | 10 (3) | 39 (5) |
| Unknown | 2 (1) | 9 (2) | 11 (1) |
| Education | |||
| High school or less | 53 (35) | 154 (40) | 146 (18) |
| Some college | 62 (41) | 176 (45) | 357 (45) |
| College | 36 (24) | 53 (14) | 289 (36) |
| Unknown | 1 (1) | 4 (1) | 5 (1) |
| Annual income | |||
| ≤ $30 000 | 57 (38) | 168 (43) | 200 (25) |
| $30 001 to $49 999 | 46 (30) | 121 (31) | 242 (30) |
| ≥ $50 000 | 46 (30) | 91 (24) | 343 (43) |
| Unknown | 3 (2) | 7 (2) | 12 (2) |
| Injection drug use | |||
| Never | 149 (98) | 294 (76) | 786 (99) |
| Ever | 2 (1) | 92 (24) | 10 (1) |
| Missing | 1 (1) | 1 (0) | 1 (0) |
Percentages may not add to 100 due to rounding. ARC indicates American Red Cross; BCP, Blood Centers of the Pacific; OBI, Okahoma Blood Institute.