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Table 4 Mean EQ-VAS scores, including standard deviation (SD) and A. lumbricoides, hookworm and T. trichiura infection, together with the scores of the negative control groups among 252 children visiting two schools in Yunnan province, P.R. China.

From: Self-rated quality of life and school performance in relation to helminth infections: case study from Yunnan, People's Republic of China

Parameter Obs. Mean EQ-VAS score SD 95% CI Min. score Max. score P-valuea
A. lumbricoides        
   Bulangshan        
Non-infected 49 66.4 19.8 60.7, 72.1 28 98 0.655
Infected 105 64.8 22.3 60.5, 69.2 0b 100  
   Pu'er        
Non-infected 89 70.5 18.4 66.7, 74.4 18 100 0.777
Infected 9 68.3 19.0 53.7, 82.9 35 90  
Hookworm        
   Bulangshan        
Non-infected 36 67.3 22.8 59.5, 75.0 0b 100 0.375
Infected 118 64.8 21.1 61.0, 68.6 25 100  
   Pu'er        
Non-infected 67 70.5 18.5 66.0, 75.0 18 100 0.757
Infected 31 69.9 18.2 63.3, 76.6 39 100  
T. trichiura        
   Bulangshan        
Non-infected 46 64.3 20.5 58.2, 70.3 27 94 0.787
Infected 108 65.8 22.0 61.6, 70.0 0b 100  
   Pu'er        
Non-infected 83 69.7 18.9 65.6, 73.8 18 100 0.445
Infected 15 74.0 15.1 65.6, 82.3 50 100  
  1. a P-values according to the Kruskal-Wallis test with 1 d.f.
  2. b 0 equals to death in EQ-VAS but some children presumably did not understand the question and answered 0.
  3. CI, confidence interval; SD, standard deviation