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Table 2 Gender and age distribution of B. pertussis in sporadic, community-based and facility-based outbreak settings

From: Bordetella pertussisin sporadic and outbreak settings in Alberta, Canada, July 2004 – December 2012

  Sporadic cases Community-based outbreaks Facility-based outbreaks
Gender ratio Suspected Confirmed Suspected Confirmed Suspected Confirmed
Male: Female* 1:1.1 1:1.2 1:1.3 1:1.0 1:1.4 1:1.1
Age category Suspected Confirmed (%) Suspected Confirmed (%) Suspected Confirmed (%)
≤8 weeks1 1,024 55 (5.4) 8 0 (0.0) 0 NA
>8 weeks - <6 months 1,522 107 (7.0) 43 6 (14.0) 3 0 (0.0)
6 months - <18 months 2,414 108 (4.5) 105 15 (14.3) 7 2 (28.6)
18 months – <5 years 3,533 177 (5.0) 246 22 (8.9) 26 10 (38.5)
5 - <10 years 2,739 169 (6.2) 273 41 (15.0) 13 4 (30.8)
10 - <15 years 2,158 319 (14.8)1 311 61 (19.6) 22 15 (68.2)
15 - <20 years 1,339 126 (9.4)1 224 29 (12.9) 12 2 (16.7)
20 - <40 years 3,412 197 (5.8) 205 8 (3.9) 30 5 (16.7)
40 - <60 years 2,506 137 (5.5) 142 9 (6.3) 3 0 (0.0)
60 years and older 773 26 (3.4) 38 0 (0.0) 8 0 (0.0)
Unknown 64 2 (3.1) 3 0 (0.0) 0 NA
  1. *443 (1.9%) of cases had unknown gender with 422 in sporadic setting and 21 in community-based outbreaks. Seven of the 443 (1.6%) cases tested positive for pertussis with all confirmed cases in the sporadic setting.
  2. 1p < 0.01, binary logistic regression with Bonferroni correction using ≤8 weeks as the reference group excluding cases with unknown age.