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Table 1 Baseline and serology data

From: Evaluation of factors influencing tick bites and tick-borne infections: a longitudinal study

Baseline 2018 2019 P-value Total
Age, years, median (range) 45 (19–65) 46.5 (21–67) 0.76 46 (19–67)
Sex, male/female 112/102 81/49 0.071 193/151
Outdoor recreational activities, no. (%) 150/214 (70.1%) 96/130 (73.8%) 0.45 246 (71.3%, 95% CI 66.5–76.1)
Outdoor work-related activities, no. (%) 54/214 (25.2%) 31/130 (23.8%) 0.708 85 (24.7%, 95% CI 20.1–29.3)
Furred pet ownership, no. (%) 108/214 (50.47%) 57/130 (43.85%) 0.474 165 (47.9%, 95% CI 42.6–53.1)
Tick bite within season, no. (%) 15/214 (7.01%) 7/130 (5.38%) 0.55 22 (6.4%, 95% CI 3.8–9)
Borrelia burgdorferi
 IgM sample 1, no. (%) 14/214 (7.48%) 13/130 (10%) 0.293 27 (7.84%, 95% CI 4.9–10.6)
 IgG sample 1, no. (%) 10/214 (4.67%) 13/130 (10%) 0.069 23 (6.7%, 95% CI 4–9.3)
 Seroconversion, no. (%)a 6/93 (6.45%) 2/34 (5.88%) 1 8/127 (6.3%, 95% CI 2.1–10.5)
Rickettsia spp. (antigen: R. helvetica)
 IgM sample 1, no. (%) 0 0   0
 IgG sample 1, no. (%) 0 0   0
 Seroconversion, no. (%) 0 1/34 (2.9%)   1/127 (0.8%, 95% CI 0.02–4.3)b
 Anti-Rickettsia felis antibodies 0 0   0
  1. aSeroconversion was defined as detection of antibodies (IgM and/or IgG) in the follow-up sample not found in the primary sample, a change from IgM to IgG antibodies, or doubling of the AU in the second sample
  2. bClopper-Pearson was used for this analysis since Cochran's rule was not fulfilled
  3. AU arbitrary units of light