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Table 1 Repellent effects of different DDA-based lotion-formulations against I. ricinus nymphs (MO-bioassay)

From: Prevention of infectious tick-borne diseases in humans: Comparative studies of the repellency of different dodecanoic acid-formulations against Ixodes ricinus ticks (Acari: Ixodidae)

Project Crawling to the tip of the glass rod Attaching the filter paper on the drum Dropping off the attachment site Repellency [%]
  n % n % n % Significance*  
Trial 1         
   Blank test 29 96.7 27 93.1 0 0   
   10% DDS 30 100 28 93.3 25 89.3 p < 0.001 88.90
   Batch 030138 30 100 23 76.7 22 95.7 p < 0.001 96.30
   Batch 030142 29 96.7 20 69.0 15 75.0 p < 0.001 81.40
Trial 2         
   Blank test 29/30 96.7 24/27 82.8/90.0 0/1 0/3.7   
   10% DDS 30 100 24 80.0 21 87.5 p < 0.001 88.5
   Batch 030174 30 100 20 66.7 17 85.0 p < 0.001 87.5
   Batch 030175 29/29 96.7/96.7 21/20 72.4/69.0 19/17 90.5/85.0 p < 0.001 91.63/88.5
   Batch 030176 28 93.3 22 78.6 20 90.9 p < 0.001 91.63
Trial 3         
   Blank test 30 100 28 93.3 0 0   
   10% DDS 30 100 24 80.0 19 79.2 p < 0.001 82.10
   Batch 040088 30 100 23 76.7 19 82.6 p < 0.001 85.74
Trial 4         
   Blank test 30 100 29 96.7 0 0   
   Batch 040108 30 100 21 70.0 21 100 p < 0.001 100
   Batch 050030 30 100 24 80.0 24 100 p < 0.001 100
  1. The quantity of repellent applied per test was about 1 mg/cm2, corresponding to approximately 0.1 mg DDA/cm2. Batch No. 050030 is identical to the final product ContraZeck® in terms of the qualitative and quantitative ingredients and fragrances. Batch No. 040088 and Batch No. 040108 are identical in terms of the qualitative and quantitative ingredients and fragrances. *Significance in relation to blank test