TABLE 1

Characteristics of study subjects

VariableValuea
Total no. of subjects259
Male sex142 (54.5)
Age at vaccination (mo)
    Mean (SD)24.1 (12.4)
    Median (range)24.0 (45.0)
Age at vaccination
    0 yr64 (25)
    1 yr65 (25)
    2 yr64 (25)
    3 yr66 (25)
Underlying illnesses
    Heart disease1 (0.4)
    Renal disease1 (0.4)
    Anemia2 (0.8)
    Asthma14 (5.4)
    Urticaria17 (6.6)
    Atopic dermatitis13 (5.0)
Influenza vaccination within the past 3 yr
    Vaccinated114 (44)
        0 yr0 (0)
        1 yr17 (15)
        2 yr46 (40)
        3 yr51 (45)
    Not vaccinated144 (56)
        0 yr64 (44)
        1 yr48 (33)
        2 yr17 (12)
        3 yr15 (10)
Influenza-like illness during the last season present122 (47)
  • a Values are expressed as no. (%) unless otherwise indicated.