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Table 3 Mean helminth eggs contamination levels of irrigation water and irrigated lettuce from ten farming sites in Addis Ababa

From: Microbiological quality of lettuce (Lactuca sativa) irrigated with wastewater in Addis Ababa, Ethiopia and effect of green salads washing methods

Sample Type Farming Sites
Sore Amba Lekunda Peacock-Urael Peacock-Bole Kera Mekanissa Lafto Hana-Mariam Akaki 08 Akaki
Irrigation Water (N = 9 for each farming site)
 Ascaris lumbricoides 14 21 19 16 20 7 17 12 18 16
 Hookworm 3 3 2 1 3 1 1 2 2 3
 Enterobius vermicularis 0 1 2 1 0 0 0 1 1 0
 Trichuris trichiura 1 1 1 0 1 0 0 1 0 0
 Taenia 0 0 0 0 2 0 1 0 0 0
 Heymenolepis nana 1 1 2 0 0 0 0 0 0 0
 Strongloyides 0 1 0 0 0 0 1 0 0 1
 Total 19 28 26 18 26 8 20 16 22 20
 Meanx 2.1(1.2)ab 3.1(2.1)a 2.9(1.8)a 2.0(1.7)ab 2.9(1.9)a 0.9(0.8)b 2.2(1.6)ab 1.8(1.6)ab 2.4(2.2)ab 2.2(1.7)ab
Lettuce (N = 15 for each farming site)
 Ascaris lumbricoides 20 28 25 17 20 16 42 25 10 31
 Hookworm 1 2 2 3 4 2 5 4 2 3
 Enterobius vermicularis 0 1 1 1 0 0 3 0 0 2
 Trichuris trichiura 0 1 0 0 1 1 3 2 0 1
 Taenia 0 0 0 0 1 0 2 0 0 0
 Strongloyides 0 0 1 0 0 0 1 0 0 0
 Total 21 32 29 21 26 19 56 31 12 37
 Meany 1.4(1.4)bc 2.1(2.3)b 1.9(1.5)bc 1.4(0.9)bc 1.7(1.7)bc 1.3(1.3)bc 3.7(2.2)a 2.1(1.8)bc 0.8(1.0)c 2.5(2.2)b
  1. xMean concentrations of helminth eggs and larvae 1000 ml−1
  2. yMean concentrations of helminth eggs and larvae 100 g−1
  3. Figures in parentheses represent standard deviation
  4. Values in the same row with different letters differ significantly (p < 0.05)