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Table 4 Baseline, midterm and endline STH prevalence (%) and relative reduction (RR) by county among Kenyan school-aged children, 2012–2017

From: Results of a national school-based deworming programme on soil-transmitted helminths infections and schistosomiasis in Kenya: 2012–2017

  STH combined Hookworm A. lumbricoides T. trichiura
County Y1 baseline Y3 midterm Y5 endline RR (%) Y1 baseline Y3 midterm Y5 endline RR (%) Y1 baseline Y3 midterm Y5 endline RR (%) Y1 baseline Y3 midterm Y5 endline RR (%)
Overall 32.3 16.4 13.5 58.2* 15.4 2.3 1.3 91.6* 18.1 11.9 9.6 46.8* 6.7 4.5 4.1 38.4*
Bomet 29.7 23.3 18.1 39.1* 0.2 0.1 0.1 49.9 27.9 20.9 15.2 45.5* 3.9 5.7 4.5 +
Bungoma 49.5 10.9 7.3 85.2* 44.0 1.8 0.9 98.0* 30.7 9.7 6.6 78.6* 0.8 0 0.2 73.5*
Busia 36.1 25.7 16.9 53.3* 20.9 3.1 2.7 87.1* 14.4 15.1 7.2 49.9* 12.5 14.1 10.1 18.9
Homa Bay 30.3 16.4 11.5 62.0* 14.7 5.2 2.7 81.9* 17.3 11.4 7.8 55.2* 5.8 2.9 2.9 50.4*
Kakamega 31.4 15.9 9.8 68.8* 23.1 0.8 0.5 97.7* 23.1 15.0 9.3 59.6* 0.7 0.7 0.3 61.1
Kericho 29.2 16.7 21.0 27.9* 5.7 0.1 0.2 97.2* 24.5 14.6 18.1 26.1* 4.7 4.0 4.8 +
Kilifi 33.5 2.9 2.9 91.3* 28.1 1.4 0.8 97.2* 2.0 0.4 0.5 75.0 6.5 1.4 1.9 70.8*
Kisii 46.8 26.2 23.7 49.4* 11.1 1.4 0.9 92.1* 39.7 25.4 22.8 42.4* 1.3 1.1 1.0 26.9
Kisumu 17.4 4.7 4.0 76.8* 8.4 0.5 0.7 92.2* 7.8 2.4 1.8 77.0* 4.1 2.0 2.0 51.6
Kwale 33.6 11.1 4.8 85.7* 27.7 9.6 3.3 88.1* 0.8 0.4 0.2 75.0 8.9 2.4 1.7 80.9*
Migori 22.3 2.1 2.2 90.2* 20.1 0.7 0.4 98.2* 3.4 1.4 1.7 49.4 0.7 0.1 0.2 65.1
Mombasa 18.1 2.5 1.8 90.1* 5.5 0.8 0.4 92.7* 1.2 0 0.4 66.7* 15.6 1.8 1.0 93.6*
Narok 53.0 39.7 43.1 18.7* 5.0 0.8 1.2 75.0* 29.3 20.3 19.7 32.7* 30.2 26.6 28.6 5.1
Nyamira 31.6 19.1 17.6 44.4* 1.9 0.4 0.1 95.1* 27.6 18.8 17.4 37.0* 3.1 0.5 0.4 87.6*
Taita Taveta 2.5 0.4 0.9 60.0* 0.9 0.1 0.4 55.6* 0.4 0 0.3 25.0 1.4 0.3 0.3 78.6*
Vihiga 50.2 35.9 32.8 34.7* 16.0 1.8 2.2 86.1* 44.4 33.9 30.0 32.5* 9.9 7.2 6.7 32.2
  1. *Statistically significant (P < 0.05) relative reduction in prevalence
  2. + indicates an increase rather than relative reduction in prevalence