*3.2. Univariate Analysis*

A total of 28 potential risk factors were analyzed. These factors were further divided into six dimensions: Personal life activities, environmental sanitation, housing situation, living conditions, mosquito protection status, and residential surroundings. As illustrated in Table 2, people who participated in outdoor activities in parks had a significantly higher probability of DF infections than those who did not participate in outdoor activities in parks (*p* = 0.049). People who participated in outdoor sports were more likely to be infected with DF than those who did not participate in outdoor sports (*p* = 0.009). At the same time, there were statistical differences in terms of housing type (*p* = 0.040), housing location (*p* = 0.061), living floor (*p* = 0.096), the average numbers of persons per room (*p* < 0.001), air-conditioner use (*p* = 0.026) and indoor daylight quality (*p* = 0.032) between the case group and the control group.




\* Significance difference: *p* < 0.1.

The existence of garbage collection sites (*p* = 0.681), junk yards (*p* = 0.570), ponds (*p* = 0.426), and construction sites (*p* = 0.639) within 200 m of residences did not show statistically significant differences between the control and case groups.
