Shaamash 2005.

Methods	Time frame and location: conducted from June 2001 to June 2003 in Assiut, Egypt Sample size calculation and outcomes of focus: Breastfeeding rate: 151 per group for 80% power to detect difference of 15 per 100 women Infant weight: 56 males and 56 females for 90% power to detect 400 gram difference at 12 months, assuming 20% attrition
Participants	General with N and source: 320 exclusively breastfeeding women; university hospital clinic Inclusion criteria: gave birth to healthy term baby with no health problem; had no contraindication to the use of LNG or copper IUD contraceptives; planning to breastfeed for at least 1 year Exclusion criteria: not specified
Interventions	Treatment: levonorgestrel‐releasing IUS (20 μg) Comparison: Copper T 380A IUD Timing: inserted 6 to 8 weeks postpartum
Outcomes	Measures: breastfeeding (full, partial); infant growth (weight, length, head circumference, mid‐arm circumference, triceps skinfold); pregnancy (presumably self‐reported) No sample sizes for analysis Assessments: 3, 6, 9, 12 months postpartum
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Randomization scheme was computer generated.
Allocation concealment (selection bias)	Low risk	Sealed opaque envelopes; opened in sequential order at time of enrollment
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	No mention
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	No information on losses or sample sizes for analysis