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Table 1 The study population enrolled in this study

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

Age group (years) Total Male Female p value
61–65 104 25 79 0.18
66–70 99 23 76  
71–75 92 27 65  
76–80 70 27 43  
81+ 65 21 44  
  1. Using the chi-square test