Table 1.

Characteristics of 294 noninfant ALL cases and 376 matched controls, the NCCLS, 1995 to 2002

CharacteristicsCases n (%)Controls n (%)P2 test)
Age*
    12-23.9 mo26 (8.8)34 (9.0)
    2-5 y179 (60.9)232 (61.7)
    6-10 y60 (20.4)72 (19.2)
    11-14 y29 (9.9)38 (10.1)
Mean (SE), y5.5 (0.2)5.4 (0.2)
Gender*
    Male152 (51.7)192 (51.1)
    Female142 (48.3)184 (48.9)
Race/ethnicity
    Hispanic120 (40.8)153 (40.7)
    Non-Hispanic White136 (46.3)172 (45.7)
    Non-Hispanic Black6 (2.0)9 (2.4)
    Other32 (10.9)42 (11.2)
Household income ($/y)
    <15,00040 (13.6)35 (9.3)0.001
    15,000-29,90059 (20.1)54 (14.4)
    30,000-44,90056 (19.0)55 (14.6)
    45,000-59,90044 (15.0)48 (12.8)
    60,000-74,90031 (10.5)49 (13.0)
    ≥75,00064 (21.8)135 (35.9)
Maternal education
    High school or less130 (44.2)130 (34.6)0.03
    High school or higher but less than bachelor's82 (27.9)135 (35.9)
    Bachelor's or higher82 (27.9)111 (29.5)
Maternal age (y)
    <25102 (34.7)103 (27.4)0.12
    25-34153 (52.0)220 (58.5)
    ≥3539 (13.3)53 (14.1)
Mean (SE)28.0 (0.3)28.8 (0.3)
Birth weight (g)
    <2,50018 (6.1)20 (5.3)0.90
    2,500-3,999223 (75.8)288 (76.6)
    ≥4,00053 (18.0)68 (18.1)
Mean (SE)3436 (35)3475 (30)
Birth order
    First123 (41.8)146 (38.8)0.80
    Third52 (17.7)65 (17.3)
    Fourth or higher23 (7.8)35 (9.3)
Mean (SE)1.99 (0.07)2.04 (0.06)
Duration of breast-feeding (mo)
    0 (never breast-fed)56 (19.0)59 (15.7)0.45
    >0 and <368 (23.1)74 (19.7)
    3-548 (16.3)75 (20.0)
    6-1161 (20.8)87 (23.1)
    ≥1261 (20.8)81 (21.5)
Mean (SE)6.25 (0.47)6.77 (0.40)
  • * These are matching variables. Age is age at the reference date (date of diagnosis for cases and the corresponding date for matched controls).

  • Controls were individually matched to cases on maternal race (White, African American, or other) and parental Hispanic status as recorded on birth certificates. The race/ethnicity information presented was reported by the biological mothers at interview.