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Table 1 Study population

From: Dengue as a cause of acute undifferentiated fever in Vietnam

  Population without paired serum samples (%) Population with paired serum samples (%) P-value
Total number 1399 697  
Females/males (ratio) 611/788 (0.78) 256/441 (0.58) 0.002
Age*(years, median, range) 15 (1–82) 24 (4 – 82) <0.001
≤ 15 year 715 (51) 181 (26)  
> 15 years 682(49) 516 (74)  
Occupation    <0.001
Farmer 473 (33.8) 347 (49.8)  
Pupil 568 (40.6) 200 (28.7)  
Child at preschool age 159 (11.4) 4 (0.6)  
Worker or fisherman 109 (7.8) 67 (9.6)  
Retired age 30 (2.1) 11 (1.6)  
Government employee 21 (1.5) 17 (2.4)  
Other 39 (2.8) 51 (7.3)  
Presumptive diagnosis    <0.001
Undifferentiated fever 689 (49.2) 387 (55.5)  
Pharyngitis 361 (25.8) 140 (20.1)  
Dengue fever 135 (9.6) 45 (6.5)  
Tonsillitis 118 (8.4) 29 (4.2)  
Typhoid fever 39 (2.8) 36(5.2)  
Diarrhoea/Enteritis 31 (2.2) 27 (3.9)  
Leptospirosis 2 (0.1) 9 (1.3)  
Hepatitis 3 (0.2) 7 (1.0)  
Acute respiratory tract infection 1 (0.1) 1 (0.1)  
Other** 20 (1.4) 16 (2.3)  
  1. * 2 cases missing age
  2. **Other: Allergy, arthritis, clinical malaria, gastritis, lymphadenitis, measles, mumps, sinusitis, varicella.