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Table 1 Characteristics of 636 survey subjects according to clinical diagnosis

From: Pertussis outbreak in university students and evaluation of acellular pertussis vaccine effectiveness in Japan

Characteristics   Total (n = 636) No symptoms (n = 391) Suspected cases (n = 161) Probable cases (n = 84) P-value*
   n (%) n (%) n (%) n (%)  
Department Medicine 389 61.2 224 57.3 107 66.5 58 69.0 0.037
  Nursing 247 38.8 167 42.7 54 33.5 26 31.0  
Grade 1 164 25.8 85 21.7 54 33.5 25 29.8 0.079
  2 158 24.8 96 24.6 59 36.6 23 27.4  
  3 156 24.5 105 26.9 35 21.7 16 19.0  
  4 158 24.8 105 26.9 33 20.5 20 23.8  
Sex Male 243 38.2 152 38.9 56 34.8 35 41.7 0.517
  Female 392 61.6 238 60.9 105 65.2 49 58.3  
  Unknown 1 0.2 1 0.3 0 0.0 0 0.0  
Continuous cough Yes 245 38.5 0   161 100.0 84 100.0  
  Less than 1 week 38 6.0 -   38 23.6 0 0.0 <0.001
  1 week or more and less than 2 weeks 102 16.0 -   102 63.4 0 0.0  
  2 weeks or more 105 16.5 -   21 13.0 84 100.0  
Characters of continuous cough (multiple answers) Proxysms of coughing 233 36.6 -   152 94.4 81 96.4 0.48
  Inspiratory whooping 22 3.5 -   12 7.5 10 11.9 0.247
  Posttussive vomiting 70 11.0 -   31 19.3 39 46.4 <0.0001
Medical institution Visited 121 19.0 -   67 41.6 54 64.3 0.0008
  Diagnosed with pertussis 56 8.8 -   30 18.6 26 31.0 0.0323
Self-report DTaP vaccination status           
  No 7 1.1 5 1.3 2 1.2 0 0.0 <0.001
  1 shot 19 3.0 9 2.3 4 2.5 6 7.1  
  2 doses 19 3.0 8 2.0 3 1.9 8 9.5  
  3 doses 10 1.6 5 1.3 5 3.1 0 0.0  
  4 doses 47 7.4 20 5.1 15 9.3 12 14.3  
  Uncertain 534 84.0 344 88.0 132 82.0 58 69.0  
  1. Clinical criteria: (1) cough illness lasting 2 weeks; (2) paroxysms of coughing; (3) inspiratory “whoop”; (4) post-tussive vomiting.
  2. Suspected case: patient with at least 1 clinical criterion.
  3. Probable case: patient with cough illness lasting ≥ 2 weeks with at least 1 other clinical criterion.
  4. *Chi-square test.