Table 2.
Selected descriptive statistics for the study population
| Controls N = 45,392 |
All Infant Leukemiasa N = 402 |
ALL N = 219 |
AML N = 131 |
|
|---|---|---|---|---|
| N (%) | N (%) | N (%) | N (%) | |
|
| ||||
| Sex | ||||
| Male | 23,935 (53) | 199 (50) | 110 (50) | 60 (46) |
| Female | 21,455 (47) | 203 (50) | 109 (50) | 71 (54) |
| Missing | 2 | 0 | 0 | 0 |
| Birth Year Category | ||||
| 1981–1989 | 17,444 (38) | 92 (23) | 42 (19) | 36 (27) |
| 1990–1997 | 22,523 (50) | 262 (65) | 156 (71) | 75 (57) |
| 1998–2004 | 5,425 (12) | 48 (12) | 21 (10) | 20 (15) |
| Missing | 0 | 0 | 0 | 0 |
| Plurality | ||||
| Singleton | 44,318 (98) | 396 (99) | 216 (99) | 128 (98) |
| Twin + | 1,046 (2) | 6 (1) | 3 (1) | 3 (2) |
| Missing | 28 | 0 | 0 | 0 |
| Birth Weight | ||||
| < 2500 g | 2,483 (5) | 17 (4) | 7 (3) | 8 (6) |
| 2500 – < 4000 g | 36,909 (82) | 332 (83) | 181 (83) | 110 (85) |
| 4000 + | 5,890 (13) | 51 (13) | 31 (14) | 12 (9) |
| Missing | 110 | 2 | 0 | 1 |
| Gestational Age | ||||
| < 37 | 3,509 (8) | 29 (7) | 15 (7) | 11 (9) |
| 37–38 | 7,274 (17) | 72 (18) | 35 (16) | 30 (23) |
| 39–40 | 18,981 (43) | 177 (45) | 97 (45) | 52 (41) |
| 41 | 7,702 (18) | 69 (18) | 36 (17) | 22 (17) |
| 42 + | 6,384 (15) | 47 (12) | 33 (15) | 13 (10) |
| Missing | 1,542 | 8 | 3 | 3 |
| Birth Order | ||||
| First | 18,305 (41) | 156 (40) | 91 (42) | 44 (34) |
| Second | 14,557 (33) | 111 (28) | 57 (27) | 38 (29) |
| Third | 11,871 (27) | 127 (32) | 67 (31) | 47 (36) |
| Missing | 659 | 8 | 4 | 2 |
|
| ||||
| Age at Diagnosis | ||||
| 1–5 months | - | 174 (43) | 101 (46) | 47 (36) |
| 6–11 months | - | 228 (57) | 118 (54) | 84 (64) |
| Missing | 0 | 0 | 0 | 0 |
| Maternal Age | ||||
| ≤ 19 | 4,750 (10) | 48 (12) | 23 (11) | 20 (15) |
| 20–24 | 11,333 (25) | 88 (22) | 51 (23) | 27 (21) |
| 25–29 | 14,166 (31) | 120 (30) | 63 (29) | 37 (28) |
| 30–34 | 10,334 (23) | 95 (24) | 56 (26) | 27 (21) |
| 35–39 | 4,060 (9) | 37 (9) | 21 (10) | 11 (8) |
| 40 + | 732 (2) | 14 (3) | 5 (2) | 9 (7) |
| Missing | 17 | 0 | 0 | 0 |
| Paternal Age | ||||
| ≤ 19 | 1,310 (3) | 20 (6) | 13 (7) | 5 (5) |
| 20–24 | 6,943 (17) | 57 (17) | 33 (18) | 19 (17) |
| 25–29 | 11,878 (29) | 87 (26) | 44 (25) | 33 (30) |
| 30–34 | 11,320 (28) | 96 (29) | 52 (29) | 26 (24) |
| 35–39 | 5,956 (15) | 42 (13) | 21 (12) | 13 (12) |
| 40 + | 2,907 (7) | 31 (9) | 15 (8) | 14 (13) |
| Missing | 5,078 | 69 | 41 | 21 |
| Maternal Race | ||||
| White | 32,846 (73) | 221 (55) | 112 (51) | 77 (59) |
| Hispanic | 6,201 (14) | 138 (35) | 85 (39) | 37 (28) |
| Other | 5,795 (13) | 40 (10) | 21 (10) | 16 (12) |
| Missing | 550 | 3 | 1 | 1 |
| Paternal Race | ||||
| White | 29,704 (74) | 210 (58) | 102 (52) | 77 (63) |
| Hispanic | 5,910 (15) | 124 (34) | 76 (39) | 35 (29) |
| Other | 4,767 (12) | 30 (8) | 18 (9) | 10 (8) |
| Missing | 5,011 | 38 | 23 | 9 |
|
| ||||
| State | ||||
| CA | 7,607 (17) | 152 (38) | 85 (39) | 49 (37) |
| MN | 5,999 (13) | 44 (11) | 23 (11) | 16 (12) |
| NY | 6,663 (15) | 68 (17) | 30 (14) | 24 (18) |
| TX | 2,385 (5) | 87 (22) | 53 (24) | 26 (20) |
| WA | 22,738 (50) | 51 (13) | 28 (13) | 16 (12) |
| Missing | 0 | 0 | 0 | 0 |
a
All leukemias includes: Lymphoid leukemia, Acute myeloid leukemia, Chronic myelogenous diseases, Myelodysplastic syndrome, Leukemia NOS