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Table 3 The geometric mean titer (GMT) level for all diseases across the different age groups enrolled in this study

From: Seroprevalence of an antibody against diphtheria, tetanus, and pertussis among the elderly in Khon Kaen, Thailand

Age (years) Total GMT level (IU/ml)
Diphtheria Tetanus Pertussis
N GMT 95% CI p value† N GMT 95% CI p value† N GMT 95% CI p value†
61–65 104 101 0.11 0.09–0.15 0.59 90 0.45 0.28–0.72 0.15 53 12.36 10.24–14.93 0.07
66–70 99 96 0.13 0.09–0.17   83 0.48 0.31–0.76   57 12.40 10.18–15.11  
71–75 92 88 0.11 0.09–0.14   72 0.24 0.14–0.39   48 12.46 10.27–15.13  
76–80 70 69 0.15 0.11–0.20   63 0.34 0.19–0.61   44 17.81 13.68–23.17  
81+ 65 64 0.11 0.08–0.15   51 0.24 0.12–0.44   38 15.08 11.56–19.68  
Total 430 418 0.12 0.11–0.14   359 0.35 0.28–0.44   240 13.67 12.42–15.06  
  1. GMT geometric mean titer
  2. †Using the one-way-ANOVA
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