Table 1 Selected characteristics of the study participants at study entry
No (%) (n = 1610)
Hispanic546 (33.9)
Age groups (years)
    7–9861 (53.5)
    10–11345 (21.4)
    >11404 (25.1)
Sex
    Girls893 (55.5)
    Boys717 (44.5)
Overweight378 (23.5)
Parental history of asthma221 (13.7)
History of atopy384 (25.3)
Household second hand smoke exposure235 (14.6)
In utero exposure to maternal smoking220 (13.7)
Current maternal smoking125 (7.8)
Pests of any kind1213 (75.3)
Pets at home1323 (82.2)
No of team sports participation
    0648 (41.0)
    1536 (33.9)
    2264 (16.7)
    ⩾3132 (8.3)
Children with health insurance1323 (82.2)
Annual family income (US dollars)*
    ⩽14 999177 (11.0)
    15 000–49 999586 (36.4)
    ⩾50 000609 (37.8)
Highest parental education level*
    Less than high school211 (13.1)
    College1138 (70.7)
    Graduate227 (14.1)

  • *The numbers do not add up to the total due to missing data.