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Table 1 Patient characteristics. Continuous variables are presented as median (IQR) and categorical variables are presented as number and percentage

From: Methods to discriminate primary from secondary dengue during acute symptomatic infection

  Primary Secondary Unknown p value Odds Ratio (95% CI)
N = 105 N = 144 N = 44
(36%) (49%) (15%)
Age (years) 13 (10.0–16.0) 14 (11.0–19.0) 14 (12.0–19.8) <  0.001 1.11 (1.05–1.17)
Sex (% male) 79 (75) 76 (53) 35 (79) <  0.001 2.79 (1.61–4.83)
Day of fever at enrolment, Number (%) 1 6 (6) 5 (4) 4 (9) 0.1  
2 51 (49) 54 (38) 19 (43)   
3 45 (43) 82 (57) 21 (48)   1.40 (0.94, 2.10)
4 2 (2) 3 (2) 0 (0)   
5 1 (1) 0 (0) 0 (0)   
Serotype Number (%) 1 75 (71) 55 (38) 8 (18) <  0.001
2 18 (17) 40 (28) 17 (40)   3.03 (1.57–5.84)
3 9 (9) 13 (9) 7 (15)   1.96 (0.79–4.91)
4 3 (3) 36 (25) 12 (27)   16.36 (4.79–55.88)
  1. P-values are for comparisons between primary and secondary infections, using univariate logistic regression