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Table 4 Classification of diagnoses being made in each of the patient groups based on serological results, stratified according to whether serological testing was performed in agreement with recommendations or not

From: Serodiagnosis of Lyme borreliosis—is IgM in serum more harmful than helpful?

  Tests following guidelines 30% (183 patients) Tests not following guidelines 70% (427 patients)
EM diagnoses included (n = 427) EM diagnoses excluded (n = 353)
a b (%) a b (%) a b (%)
Total 96/183 52.5 134/427 31.4 72/353 20.4
   Confident 66/96 68.8 47/134 35.1 0/72 0.0
   Doubtful 24/96 25.0 51/134 38.1 37/72 51.4
   Unlikely 6/96 6.3 36/134 26.9 35/72 48.6
IgM 4/11 36.4 18/32 56.3 9/23 39.1
   Confident 1/4 25.0 9/18 50.0 0/9 0.0
   Doubtful 1/4 25.0 5/18 27.8 5/9 55.6
   Unlikely 2/4 50.0 4/18 22.2 4/9 44.4
IgM + IgG 30/32 93.8 50/62 80.6 22/34 64.7
   Confident 22/30 73.3 21/50 42.0 0/22 0.0
   Doubtful 7/30 23.3 22/50 44.0 15/22 68.2
   Unlikely 1/30 3.3 7/50 14.0 7/22 31.8
IgG 62/140 44.3 66/333 19.8 41/296 13.9
   Confident 43/62 69.4 17/66 25.8 0/41 0.0
   Doubtful 16/62 25.8 24/66 36.4 17/41 41.5
   Unlikely 3/62 4.8 25/66 37.9 24/41 58.5
  1. aNumber of LB diagnoses/number of positive test results
  2. bPercentage of positive test results ending up in a diagnosis of LB