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Table 2 The Geometrical Mean Concentration (GMC), with 95% CI, of serum samples from pertussis cases and from internal controls at week 9, 13 and 60 of the epidemic, and of the serum samples from the external controls (n = 4275)

From: Sensitivity and specificity of single IgA and IgG antibody concentrations for early diagnosis of pertussis in adults: an evaluation for outbreak management in public health practice

Subjects and time of sampling during the pertussis epidemic Number of samples IgA IgG
   GMC 95% CI GMC 95% CI
Cases (n = 46)      
- week 9 43 123 75 – 202 252 119 – 535
- week 13 46 172 121 – 244 355 235 – 537
- week 60 40 60 40 – 89 34 22 – 53
Internal controls (n = 35)      
- week 9 34 9.4 6.4 – 13.7 6.0 3.9 – 9.3
- week 13 34 7.8 5.2 – 11.6 3.8 2.4 – 6.1
- week 60 29 6.6 4.4 – 9.9 2.8 1.8 – 4.2
- week 9, 13 and 60 combined 97 7.9 6.3 – 9.9 4.1 3.1 – 5.3
External controls (n = 4275) 4275 8.5 7.9 – 9.1 7.4 6.7 – 8.3