Kloetzel 1982.

Methods	RCT Length of follow‐up: 10 months
Participants	All children living in endemic area Number analysed for primary outcome: 337; unclear how many randomized Age range: 1 to 8 years old Inclusion criteria: enlisted from 9 rural communities in Pariquera‐Acu state of Sao Paulo Exclusion criteria: none stated
Interventions	Single dose vs placebo Mebendazole: 100 mg twice per day for 3 days Placebo
Outcomes	Weight Height Head, chest, and mid‐arm circumference Triceps skinfold Stool egg counts (Kato‐Katz)
Notes	Location: Cameroon Burden: high Results reported as changes in nutritional status grouped into 3 categories: improved, deteriorated, no change (unclear on basis of which parameter), and proportions compared Source of funding: Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP).
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "Randomized", no further details provided.
Allocation concealment (selection bias)	Unclear risk	No details reported.
Blinding (performance bias and detection bias) All outcomes	Unclear risk	Described as double‐blind, no details reported.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	No details about losses to follow‐up reported; quote: "the present report only deals with those 337 that could be followed throughout the entire 10 months". Inclusion of all randomized participants (number evaluable/number randomized): unclear (337 analysed).
Selective reporting (reporting bias)	Low risk	All stated outcomes reported.
Other bias	Low risk	No obvious other sources of bias.