Volume 16, Number 12—December 2010
Alkhurma Hemorrhagic Fever in Humans, Najran, Saudi Arabia
|Risk factor||Crude OR (95% CI)||Model aOR† (95% CI)|
|Contact with domestic animals||5.39 (1.74–17.3)||3.17 (0.96–10.43)|
|Tick bites||11.48 (2.51–59.73)||6.20 (1.34–28.70)|
|Adjacent farm distance||4.00 (1.40–11.75)||3.63 (1.25–10.49)|
*OR, odds ratio; CI, confidence interval; aOR, adjusted OR.
†aOR for risk factors (contact with domestic animals, tick bites, adjacent farm distance) after elimination of nonsignificant variables (drinking unpasteurized milk and owning or raising domestic animals) calculated by using backward stepwise strategy.