Table 1 Frequency of different complications in fatal and non-fatal pertussis cases in different age groups in Brazil, 2007–2014. The rates displayed are the number of children with the specific complication/total number of children in each category (cured or fatal cases). Comparison of proportions was performed with the chi-square test
From: Increasing incidence of pertussis in Brazil: a retrospective study using surveillance data
Complications | ||||||
|---|---|---|---|---|---|---|
Age group | Pneumonia | Encephalopathy | Dehydration | Otitis | Malnutrition | |
0–2 months | Cured cases | 1237/6787 (18.2 %) | 88/6763 (1.3 %) | 159/6778 (2.3 %) | 44/6748 (0.7 %) | 71/6765 (1 %) |
Fatal cases | 233/370 (63 %) | 24/346 (6.9 %) | 34/351 (9.7 %) | 2/341 (0.6 %) | 16/349 (4.6 %) | |
p-Value | <0.001 | <0.001 | <0.001 | 0.84 | <0.001 | |
3–6 months | Cured cases | 701/4550 (15.4 %) | 49/4534 (1.1 %) | 117/4533 (2.6 %) | 64/4523 (1.4 %) | 50/4526 (1.1 %) |
Fatal cases | 57/83 (68.7 %) | 9/78 (11.5 %) | 10/79 (12.6 %) | 2/78 (2.6 %) | 4/78 (5.1 %) | |
p-Value | <0.001 | <0.001 | <0.001 | 0.39 | 0.006 | |
7–15 months | Cured cases | 243/1764 (13.8 %) | 14/1757 (0.8 %) | 44/1758 (2.5 %) | 46/1756 (2.6 %) | 29/1758 (1.6 %) |
Fatal cases | 13/21 (61.9 %) | 1/19 (5.2 %) | 0 | 1/20 (5 %) | 0 | |
p-Value | <0.001 | 0.39 | - | 0.96 | - | |
16 months–4 years | Cured cases | 236/2612 (9 %) | 15/2610 (0.6 %) | 53/2615 (2 %) | 51/2607 (2 %) | 33/2609 (1.3 %) |
Fatal cases | 3/10 (30 %) | 0 | 0 | 0 | 2/10 (20 %) | |
p-Value | 0.08 | - | - | - | <0.001 | |
5–14 years | Cured cases | 115/2557 (4.5 %) | 9/2550 (0.3 %) | 42/2558 (1.6 %) | 64/2555 (2.5 %) | 23/2551 (0.9 %) |
Fatal cases | 1/4 (25 %) | 1/4 (25 %) | 0 | 0 | 0 | |
p-Value | 0.44 | <0.001 | - | - | - | |
>15 years | Cured cases | 83/2152 (3.9 %) | 5/2151 (0.2 %) | 18/2154 (0.8 %) | 38/2153 (1.8 %) | 8/2152 (0.4 %) |
Fatal cases | 1/4 (25 %) | 0 | 0 | 0 | 1/4 (25 %) | |
p-Value | 0.37 | - | - | - | <0.001 | |