TABLE 1

Characteristics of the Study Population According to the Site of Injection

CharacteristicArm Injection Site, (n = 174 715), %Thigh Injection Site (n = 58 901), %
Age at vaccination
    4 y68.246.9
    5 y30.050.9
    6 y1.82.3
Male51.150.6
BMIa
    9.7–14.27.710.6
    14.3–16.861.964.1
    16.9–29.330.425.3
  • a Among children with valid BMI values (n = 35 362, arm injection site; and n = 35 290, thigh injection site). The BMI distribution varied significantly between the arm and thigh injection-site groups (P < .01).