Table 1 Index case description
From: Hospital-based prospective study of pertussis in infants and close contacts in Tehran, Iran
| Â | Total | B. pertussis cases | Negative cases | Â |
|---|---|---|---|---|
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) | – |