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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