Ref (type)	Population	Outcome, Interventions	Results and statistical analysis	Effect size	Favours
Clinical failure
Systematic review	40 people 2 RCTs in this analysis	Clinical failure 1–14 days after completion of treatment 0/20 (0%) with metronidazole 0/20 (0%) with ornidazole	The review reported that the number of trials was too small to detect any difference
Systematic review	118 people 2 RCTs in this analysis	Clinical failure 15–60 days after completion of treatment 0/59 (0%) with metronidazole 1/59 (2%) with ornidazole	RR 3.00 95% CI 0.13 to 71.89 P = 0.50 The review reported that the number of trials was too small to detect any difference		Not significant
Parasitological failure
Systematic review	40 people 2 RCTs in this analysis	Parasitological failure 1–14 days after completion of treatment 0/20 (0%) with metronidazole 0/20 (0%) with ornidazole	The review reported that the number of trials was too small to detect any difference
Systematic review	135 people 2 RCTs in this analysis	Parasitological failure 15–60 days after completion of treatment 6/69 (9%) with metronidazole 1/66 (2%) with ornidazole	RR 0.18 95% CI 0.02 to 1.41 P = 0.10 The review reported that the number of trials was too small to detect any difference		Not significant