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Table 1 Frequency of symptoms upon admission

From: Incidence of dengue and chikungunya viruses in mosquitoes and human patients in border provinces of Vietnam

Patient data (n = 558) Valuea Odds ratio < 18 years
(n = 269)
> 18 years
(n = 289)
P-valueb
Age (years) 26 (0.4–74)   (0.4–18) (19–74)  
Sex (M/F) (%)   305/253 (54.6/45.4) 1.2    
Duration of febrile state (days)   3.6 (1–7)     
Signs and symptoms Temperature on admission (°C) 38.8 (38–40)     
Headache 248 (44) 0.8 36.4 51.9 0.0003
Myalgia 328 (59) 1.4 30.8 64.8 0.0001
Arthralgia 117 (21) 0.3 10.0 31.1 0.0001
Rash 189 (16) 0.5 35.3 32.5 0.5311
Petechia 156 (10) 0.4 15.6 38.8 0.0001
Nausea/ Vomiting 68 (3.2) 0.13 13.7 1.04 0.0001
Positive tourniquet test 53 (9.5) 0.1 4.5 14.2 0.0001
Warning sign Back pain 56 (10) 0.11 1.85 17.7 0.0001
Bleeding gums 18 (3.2) 0.03 0.74 5.54 0.0001
Abdominal pain 38 (6.8) 0.07 3.34 10.03 0.001
  1. aMean (range) or number (%)
  2. bChi-square and Fisher’s exact test