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Table 1 Main results and rates of seropositivity.

From: Utilization of serology for the diagnosis of suspected Lyme borreliosis in Denmark: Survey of patients seen in general practice

Variable Category N IgG positive IgM positive Treated
    % OR(95%CI) % OR(95%CI) % OR(95%CI)
  Total 2643 3.4   10.4   21.1 1N = 2569
Age group 0-15 years 195 3.1 0.60(0.25-1.44) 21.0 2.29(1.52-3.47) 24.3 0.84(0.55-1.3)
  16-50 years 1162 1.8 0.39(0.23-0.65) 9.0 1.01(0.76-1.34) 18.3 0.96(0.76-1.2)
  >50 years 1286 4.8 reference 10.0 reference 23.2 reference
Sex Female 1509 3.1 reference 10.1 reference 21.5 reference
  Male 1134 3.7 1.23(0.79-1.91) 10.7 1.00(0.77-1.30) 20.6 0.90(0.72-1.1)
Reported tick bite No bite 1468 3.3 reference 9.2 reference 12.0 reference
  2"Insect bite" 346 2.0 0.42(0.18-0.97) 7.2 0.50(0.32-0.79) 26.8 1.36(0.98-1.9)
  Tick bite 829 4.0 0.88(0.54-1.44) 13.6 1.05(0.79-1.47) 34.9 2.9(2.2-3.7)
3Exposure Low 167 1.2 0.39(0.09-1.70) 6.0 0.81(0.40-1.63) 21.1 0.54(0.27-1.1)
  Normal 2153 3.2 reference 10.7 reference 22.1 reference
  High 323 5.6 1.59(0.89-2.83) 10.2 0.95(0.63-1.43) 7.9 0.90(0.64-1.3)
Suspected Lyme disease manifestation 4
Rash 1011 4.7 1.82(0.95-3.47) 17.2 3.30(2.22-4.89) 44.9 7.2(5.0-10)
Early neuroborreliosis 340 2.4 0.88(0.36-2.15) 6.2 0.95(0.55-1.63) 7.7 0.72(0.44-1.2)
Lymphocytoma 28 0   7.1 0.65(0.13-3.13) 17.9 1.80(0.62-5.3)
Carditis 14 0   21.4 3.66(0.93-14.35) 23.1 1.90(0.41-8.7)
Arthritis 603 2.3 0.79(0.37-1.66) 6.6 0.97(0.63-1.52) 8.4 0.63(0.42-0.94)
Acrodermatitis 67 10.4 3.20(1.24-8.25) 10.4 1.42(0.61-3.28) 13.6 0.93(0.42-2.1)
Chronic Neuroborreliosis 130 1.5 0.54(0.25-1.18) 5.4 0.87(0.45-1.69) 5.5 0.57(0.24-1.35)
Various 330 1.5 0.52(0.19-1.44) 6.7 0.91(0.53-1.56) 7.8 0.63(0.38-1.1)
No current clinical symptoms 367 3.8 1.22(0.61-2.46) 9.5 1.21(0.78-1.87) 8.3 0.38(0.24-0.60)
  1. Characteristics of 2,643 patients tested for Borrelia antibodies. The table includes the rates of seropositivity for IgG and IgM, the percent of patients treated with antibiotics, and the corresponding odds ratios for the three multivariate logistic regression models.
  2. Statistically significant odds ratios (OR) with 95% Confidence Intervals (CI) not including "one" are highlighted with bold
  3. 1Missing information about treatment from 74 patients.
  4. 2This option was called "other insect bite" on the questionnaire.
  5. 3Exposure was proposed as High if the patient was a farmer, forest worker and hunter or other patients with similar outdoor activities. Low exposure was proposed as a "person in rare contact with nature". All others were considered "normal".
  6. 4More than one symptom was registered for some patients. Categories for each symptom are "present" with "absent" as reference. The table has been shortened by omitting the% IgG positive,% IgM positive and% Treated for the patients when the respective symptom(s) are absent. These percentages were similar to the total average% positive/treated at the top of the table.