Attallah 2013.

Methods	Randomised controlled open‐label trial Duration of the study: unclear
Participants	Country: Egypt Population: men with isolated idiopathic athenozospermia, prior to intrauterine insemination (IUI), N = 60 Mean age: unknown, quote "both treatment groups were homogenous at the time of randomisation regarding the type and duration of infertility" Inclusion criteria: couples with idiopathic athenozospermia (progressive motility < 32%) with normal other seminal criteria and normal infertility workup for female partner Exclusion criteria: unclear
Interventions	N‐acetylcysteine (NAC) 600 mg (n = 30) versus No treatment (n = 30) Duration of treatment: 12 weeks
Outcomes	Sperm concentration, progressive sperm motility, clinical pregnancy rate
Notes	Conference abstract, no full text. Attempted to contact authors 04.02.2014, unable to find e‐mail address. Letter posted 12.02.2014
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Quote: "Couples were randomised" Not mentioned
Allocation concealment (selection bias)	Unclear risk	Not mentioned
Blinding of participants and personnel (performance bias) All outcomes	High risk	Quote: "Open‐labelled"
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	Unknown ‐ conference abstract