Van Kets 1987.

Methods	Location and time frame: Gent, Belgium, from October 1983 to June 1986 Design: RCT Sample size calculation and outcome of focus: no mention
Participants	General with N: 408 women Inclusion criteria: no mention Exclusion criteria: no mention
Interventions	IUD insertion within 10 minutes of delivery of placenta Treatment: Postpartum Nova T (Nova‐T‐PP) Comparison: Nova T
Outcomes	Reported pregnancy, expulsion, and continuation rates Assessment times: 1, 3, 9 months and annually up to 3 years
Notes	Limited details about methods of trial
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	No mention
Allocation concealment (selection bias)	Unclear risk	No mention
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	No mention
Incomplete outcome data (attrition bias) All outcomes	Low risk	Loss to follow‐up (reported gross cumulative event rates): 12‐month and 24‐month (same), Nova‐T‐PP 6.2 (95% CI 3.0 to 11.4); Nova‐T 6.2 (95% CI 3.0 to 11.3)