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Table 3 Univariate analyses of risk factors related to Babesia microti infection

From: High prevalence of Babesia microti in small mammals in Beijing

Variable Sample size Babesia microti infection
Cases Constituent ratio (%) Positive rate (%) χ2 P-value
Year 2014 446 32.1 10.8 1.78 0.410
2017 419 30.1 11.7   
2018 526 37.8 13.5
Altitude (m)  ≤ 40 305 21.9 5.9 16.47  < 0.001
40–400 903 64.9 14.5
 > 400 183 13.2 10.4
Gender Female 514 39.4 9.9 4.77 0.029
Male 790 60.6 14.2
Age Adult 1149 82.6 13.3 8.88 0.003
Pubertal 242 17.4 6.2
Ecological habitat Residential 822 59.1 7.2 73.34 0.000
Shrub 135 9.7 27.4
Mixed forest 143 10.3 8.40
Broad-leaved forest 191 13.7 23.00
Cropland 100 7.2 16.00
  1. This table shows that significant differences were related to different altitudes, genders, ages, and types of ecological habitat of the small mammals, but not to different sampling years, based on the univariate analyses using Chi-square test