TABLE 1

Characteristics of the studied population according to age and positivity to pertussis laboratory analysis

CharacteristicData for group no. (age range):
1 (<1 yr)2 (1–6 yr)3 (≥7 yr)
Total (n = 260)Pertussis positive (n = 101)aTotal (n = 81)Pertussis positive (n = 31)aTotal (n = 162)Pertussis positive (n = 94)a
Age (mean [range])b3 (1–11)2.7 (1–8)3 (1–6)3 (1–6)26 (7–88)24 (7–74)
Gender (n [%] female)153 (59)63 (62.4)48 (59.3)19 (61.3)105 (64.8)56 (59.6)
Time since cough onset
    Mean (SD) (days)16 (10)17 (10.4)24 (17.8)26 (18)26 (19)30 (18.5)
    Range (days)7–637–507–937–787–987–93
  • a Positive by at least one test.

  • b Ages given for group 1 are in months and for groups 2 and 3 are in years.