Nozha 2001.

Methods	Randomised comparative study Duration of study: unclear
Participants	Country: Tunisia Population: infertile males with OAT, N = unclear Mean age: unclear Inclusion criteria: males with OAT. Exclusion criteria: unclear
Interventions	Vitamin E 400 mg + Selenium 200 μg (n = 12) versus Vitamin B2, B6 and B12 (n = 8) Duration of treatment: 3 months
Outcomes	Seminal parameters
Notes	Abstract only Attempted to contact authors regarding methods of randomisation and data. No reply as yet (2014). No extractable data from the abstract.
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "In a prospective randomised comparative study"
Allocation concealment (selection bias)	Unclear risk	Not mentioned
Blinding of participants and personnel (performance bias) All outcomes	High risk	Control is no treatment
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not mentioned
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Not mentioned
Selective reporting (reporting bias)	Unclear risk	Outcomes reported. No protocol available.