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Table 5 Univariate (crude) and multivariate (adjusted) analysis of factors predicting hospitalization and DHF at infection two

From: Sequential dengue virus infections detected in active and passive surveillance programs in Thailand, 1994–2010

  Odds ratio (95% CI) of hospitalization over non-hospitalization at infection two Odds ratio (95% CI) of DHF over non-DHF at infection two
  Crude Adjusted Crude Adjusted
Time between infections 1.80* 2.35* 1.62* 3.83*
  (1.21-2.67) (1.39-3.99) (1.27-2.06) (1.71-8.59)
Age at infection one 1.06 1.45 0.97 2.11*
  (0.79-1.40) (0.97-2.16) (0.72-1.29) (1.13-3.93)
Severity at infection one (non-hospitalized as reference)   
DHF 0.87 0.76 2.26 2.70
  (0.19-4.05) (0.14-4.17) (0.44-11.66) (0.39-18.86)
Hospitalized dengue 4.58* 4.22* 5.84* 6.23*
  (1.37-15.24) (1.18-15.07) (1.32-25.79) (1.20-32.40)
  1. *Significant at p < 0.05.