Table 2.

Sociodemographic characteristics of children with leukemia and controls recruited in the NCCLS, 1996–2008

Acute lymphoblastic leukemiaAcute myeloid leukemia
CasesControlsCasesControls
Na (%)Na (%)Nb (%)Nb (%)
767975135164
Child's sex
 Male431 (56)560 (57)72 (53)89 (54)
 Female336 (44)415 (43)63 (47)75 (46)
Child's age at diagnosis (years)
 0–183 (11)105 (11)38 (30)51 (31)
 >1–2436 (57)561 (58)28 (19)32 (20)
 >2–5110 (14)144 (15)17 (13)22 (13)
 >5–14138 (18)165 (17)52 (38)59 (36)
 Mean5.5 (SD 3.5)5.4 (SD 3.4)6.6 (SD 4.9)6.3 (SD 4.8)
Child's race/ethnicity
 Hispanic362 (47)416 (43)61 (45)69 (42)
 Non-Hispanic White267 (35)391 (40)50 (37)64 (39)
 Non-Hispanic others138 (18)168 (17)24 (18)31 (19)
Household annual income (USD)
 <15,000119 (16)96 (10)28 (21)13 (8)
 15,000–29,999136 (18)123 (13)24 (18)25 (15)
 30,000–44,999120 (16)120 (12)20 (15)17 (10)
 45,000–59,999110 (14)136 (14)14 (10)26 (16)
 60,000–74,99956 (7)108 (11)12 (9)14 (9)
 ≥75,000226 (29)392 (40)37 (27)69 (42)
Mother's age at birth (years)
 Mean28.3 (SD 6.2)29.2 (SD 6.1)27.8 (SD 6.6)29.7 (SD 5.9)
Mother's education
 No schooling or elementary school91 (12)75 (8)13 (10)16 (10)
 High school or similar248 (32)269 (28)48 (36)44 (27)
 College or similar215 (28)302 (31)33 (24)43 (26)
 Bachelor's degree or higher213 (28)328 (34)41 (30)61 (37)
 Unknown01 (0)00
Father's age at birth (years)
 Mean31 (SD 7.0)31.7 (SD 7.2)30.7 (SD 7.3)32.0 (SD 6.4)
Father's education0
 No schooling or elementary school93 (12)102 (10)15 (11)17 (10)
 High school or similar269 (35)295 (30)56 (41)52 (32)
 College or similar152 (20)247 (25)19 (14)38 (23)
 Bachelor's degree or higher230 (30)302 (31)42 (31)54 (33)
 Unknown23 (3)29 (3)3 (2)3 (2)

Abbreviation: USD, United States dollars.

  • aIncludes 113 cases/146 controls in phase I (1996–1999; 1995 excluded from the analyses) and 654 cases/829 controls in phase II (2000–2008).

  • bIncludes 32 cases/37 controls in phase I (1996–1999; 1995 excluded from the analyses) and 103 cases/127 controls in phase II (2000–2008).