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Table 2 Exposure, signs and symptoms of febrile patients, presenting to a primary health care facility, with serologically confirmed acute primary dengue and secondary dengue and febrile patients without dengue.

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

  Other febrile disease a
(n = 463)
Acute primary dengue b
(n = 32)
Acute secondary dengue c
(n = 202)
P value
Age (median, range) 24 (4 – 82) 19 (5 – 68) 23 (5 – 74) 0.013*
Sex, no. (%)     ns
   Male 288 (62.2) 19 (59.4) 134 (66.3)  
   Female 175 (37.8) 13 (40.6) 68 (33.7)  
Exposure factors, no. (%)
Waded through flooded terrain 61 (13.2) 4 (12.5) 34 (16.8) 0.003 c
Days of illness (median, range) 2 (0 – 10) 3 (1 – 10) 2 (0 – 11) ns
Days of fever (median, range) 1 (0 – 9) 1 (0 – 10) 2 (0 – 11) ns
Days in bed (median, range) 1 (0 – 8) 1 (0 – 7) 2 (0 – 9) ns
Symptoms, no. (%)
Headache 446 (96.3) 27 (84.4) 198 (98.0) 0.012 b
Anorexia 387 (83.6) 24 (75.0) 161 (79.7) ns
Myalgia 272 (58.7) 15 (46.9) 126 (62.4) 0.047 c
Sore throat 196 (42.3) 17 (53.1) 81 (40.1) ns
Backache 160 (34.6) 10 (31.3) 61 (30.2) ns
Nausea 151 (32.6) 8 (25.0) 53 (26.2) ns
Cough 133 (28.7) 17 (53.1) 62 (30.7) ns
Running nose 118 (25.5) 13 (40.6) 31 (15.3) 0.009 c
Arthralgia 67 (14.5) 5 (15.6) 25 (12.4) 0.038 b
Abdominal pain 66 (14.3) 7 (21.9) 33 (16.3) 0.005 c
Vomitus 63 (13.6) 5 (15.6) 24 (11.9) ns
Diarrhoea 35 (7.6) 1 (3.1) 9 (4.5) 0.047 c
Findings at physical examination, no. (%)
Tender muscles on palpation 241 (52.1) 16 (50.0) 87 (43.1) ns
Red pharynx 231 (49.9) 21 (65.6) 93 (46.0) ns
Pallor 140 (30.2) 14 (43.8) 46 (22.8) 0.047 b
Rhinitis 104 (22.5) 14 (43.8) 31 (15.3) ns
Abdominal tenderness 88 (19.0) 8 (25.0) 31 (15.3) ns
Arthritis 67 (14.5) 5 (15.6) 25 (12.4) ns
Dehydration 56 (12.1) 3 (9.4) 20 (9.9) ns
Tender liver 33 (7.1) 0 11 (5.4) ns
Conjunctivitis 27 (5.8) 3 (9.4) 13 (6.4) ns
Tourniquet test (number of petechie/square inch >0; median; range) n = 38
5.5 (2 – 70)
n = 1
2 (2)
n = 22
8 (1 – 55)
ns
  1. P value of multinomial logistic regression; (a): reference category for (b) and (c); ns: no significant
  2. * Kruskal Wallis Test