Table 1.

Sociodemographic variables distribution, IAL cases and controls, Brazil, 1999-2005

Cases (n = 202), n (%)Controls (n = 440), n (%)P
Age at hospitalization (mo)
    0-15103 (51.0)262 (59.5)0.04
    16-2199 (49.0)178 (40.5)
Sex
    Male100 (49.6)233 (53.0)0.488
    Female102 (50.4)207 (47.0)
Race (skin color)*
    White106 (52.5)156 (35.6)0.004
    Intermediate58 (28.7)142 (32.2)
    Black38 (18.8)142 (32.2)
Maternal age (y)
    <184 (2.0)39 (8.9)0.002
    18-2466 (32.7)185 (42.0)
    25-3499 (49.0)162 (36.8)
    >3533 (16.3)54 (12.3)
Population density (residence area)
    <10,00011 (5.4)18 (4.0)0.001
    10,000-39,99928 (13.9)36 (8.2)
    40,000-99,99927 (13.4)52 (11.9)
    100,000-499,00050 (24.8)83 (18.9)
    500,000-1,000,00018 (8.9)39 (8.9)
    >1,000,00068 (33.7)212 (48.1)
Geographic origin in Brazil
    Southeast117 (57.9)251 (57.1)0.001
    Northeast51 (25.2)104 (23.6)
    South24 (11.9)51 (11.6)
    Central plateau10 (5.0)34 (7.7)
Mother education (y)
    <4104 (51.5)208 (47.2)0.001
    5-974 (36.6)198 (45.0)
    ≥1024 (11.9)34 (7.7)
Monthly family income
    <40099 (49.0)276 (62.7)0.001
    400-99950 (24.8)111 (25.2)
    1,000-1,99935 (17.3)42 (9.5)
    ≥2,00018 (8.9)11 (2.5)
  • * According to Parra et al. (14).

  • In Real ($R, the Brazilian currency).