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Table 1 Index case description

From: Hospital-based prospective study of pertussis in infants and close contacts in Tehran, Iran

  Total B. pertussis cases Negative cases  
N = 199 N = 40 (20.1%) N = 159 (79.9%)
N (%) n (%) n (%) P value
Site
 1 83 (41.7) 15 (37.5) 68 (42.8) 0.546
 2 116 (58.3) 25 (62.5) 91 (57.2)
Gender
 Boys 115 (57.8) 23 (60.0) 91 (57.2) 0.751
 Girls 84 (42.8) 16 (40.0) 68 (42.8)
Age (months)
 Median (IQR) 2.0 (1.3–2.8) 2.2 (1.4–2.9) 1.9 (1.2–2.8) 0.227
  < 3 157 (79.9) 31 (77.5) 126 (79.3) 0.809
  ≥ 3 42 (21.1) 9 (22.5) 33 (20.7)
Pertussis immunization
 Unknown 2 (0.0) 0 (0) 2 (0.0)  
 Non-vaccinated 124 (62.3) 20 (50.0) 104 (65.4)
  Age > 75 days 4 (3.2) 1 (5.3) 3 (2.9) 0.624
 Vaccinated 73 (36.7) 20 (50.0) 53 (33.3)
  Booklet - 1 dose 58 (29.4) 17 (42.5) 41 (26.1)
  Booklet - 2 doses 12 (6.1) 1 (2.5) 11 (7.0)
  Booklet - 3 doses 2 (1.0) 1 (2.5) 1 (0.6)
  Declarative 1 (0.5) 1 (2.5) 0 (0)
    >> > Timeliness 71    
     Dose 1 68 (95.8) 19 (100) 49 (94.2) 0.285
     Dose 2 14 (100) 2 (100) 12 (100)
     Dose 3 2 (100) 1 (100) 1 (100)