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Table 2 Effects of vitamin A supplementation on reinfection rates of STH after 3 and 6 months of the interventions among Aboriginal schoolchildren

From: Does vitamin A supplementation protect schoolchildren from acquiring soil-transmitted helminthiasis? A randomized controlled trial

Infections/groups Baseline After 3 monthsa After 6 monthsa
Ascaris    
Vitamin A 69.4 (60.7, 76.9) 27.8 (17.6, 36.1) 76.8 (61.5, 79.1)
Placebo 65.8 (57.0, 73.7) 28.7 (17.7, 36.8) 73.1 (60.0, 77.5)
P-value 0.552 0.781 0.453
Trichuris    
Vitamin A 96.7 (91.8, 98.6) 39.9 (29.2, 46.5) 65.8 (53.1, 68.7)
Placebo 97.5 (92.9, 99.1) 39.7 (27.6, 44.7) 66.5 (55.8, 70.1)
P-value 0.710 0.983 0.847
Hookworm    
Vitamin A 14.9 (9.6, 22.3) 17.4 (4.6, 37.1) 56.4 (30.8, 69.1)
Placebo 10.8 (6.5, 17.7) 33.3 (11.4, 56.4) 51.9 (30.5, 65.0)
P-value 0.349 0.485b 0.411
  1. All values are prevalence/reinfection rates in percentages (95% CI).
  2. aReinfection rate (95% CI) of infected subjects at 3 or 6 months: (Reinfection rates = Number of infected subjects at 3 or 6 months/number of infected subjects before deworming x 100), Chi-square test.
  3. bFisher’s exact test.