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Table 3 Presumptive diagnosis and serological evidence of acute dengue

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

Presumptive clinical diagnosis Number of cases Serological evidence of acute dengue P value
   No positive (%) OR* 95% CI  
Total 697 234 (33.6)    
Dengue fever 45 22 (48.9) 1,985 1,082 – 3,643 0,027
Other 652 212 (30.4)    
   Undifferentiated fever 387 137 (35.4) 1,203 0,876 – 1,654 0,254
   Pharyngitis 140 44 (31.4) 0,885 0,595 – 1,317 0,548
   Typhoid fever 36 12 (33.3) 0,989 0,485 – 2,014 0,975
   Tonsillitis 29 7 (24.1) 0,618 0,260 – 1,469 0,272
   Diarrhoea 27 6 (22.2) 0,554 0,220 – 1,392 0,203
   Leptospirosis 9 1 (11.1) 0,244 0,030 – 1,963 0,151
   Hepatitis 7 3 (42.9) 1,490 0,331 – 6,714 0,601
   Acute respiratory tract infection 1 0 (0)    
   Others 16 2 (12.5) 0,276 0,062 – 1,227 0,071
  1. * OR: odds ratio in logistic regression mode = (number of acute dengue/number of no acute dengue, among presumptive diagnosis)/(number of acute dengue/number of no acute dengue, among all other diagnoses)