Interval independent variable in binary logistic regression

#1
Hi everyone:

I am a bit new to logistic regression and I could use some advice. I am trying to discover the influence of various variables on voting turnout in an election study. Although I have one problem: The household income variable is coded as interval variable with 16 categories, each interval is 5000€. Can I use this variable as continuous or do I have to create dummy variables for each category as if it would have beeen a normal categorical variable?
 
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