Nacar 2003.

Methods	Location and time frame: the Kayseri Maternal and Child Health Hospital, city of Kayseri, Turkey. Conducted from December 1999 to June 2000. Design: Allocation likely to have been alternate. Questionnaire about eligibility criteria was administered to intervention and control groups on alternate days. Intervention provided immediately after the questionnaire. Sample size calculation: 150 women in each group (300 total) to detect 20% increase of contraceptive prevalence (from 60% to 80%), accounting for possible loss to follow up.
Participants	General with N: 260 women who delivered at Kayseri Hospital in December 1999 Source: local hospital Inclusion criteria: living in the city of Kayseri; had telephone at home or could be contacted by telephone. Exclusion criteria: not specified
Interventions	Study focus: Effect of education on postpartum contraceptive use Treatment: 20‐minute educational session on postpartum family planning, lactation‐contraception relationship, and contraceptive options during this period. Each woman given brochure on 'Postpartum Family Planning.' Control: baseline questionnaire only
Outcomes	Primary: Postpartum contraceptive use, reported as modern or traditional method. Modern (effective) included IUD, OCs, injectable contraceptives, implant (Norplant), tubal ligation, vasectomy, diaphragm and spermicides. Traditional (limited effectiveness) included withdrawal, calendar, and lactation methods. Secondary: not applicable Assessment times: follow up at 6 months.
Notes	Article in Turkish; translation of table headings and study characteristics extracted.
Risk of bias
Bias	Authors' judgement	Support for judgement
Exposed cohort representativeness	Unclear risk	Women who gave birth at specific hospital and could be contacted by telephone.
Nonexposed cohort selection	Low risk	Same source as exposed cohort
Exposure ascertainment: method used	Low risk	Presumably study records; intervention was provided in hospital
Comparability of groups: design or analysis	High risk	Analysis not adjusted for potential confounders. Prior contraceptive use reportedly differed between groups but not analysis not adjusted.
Outcome assessment: method used	Unclear risk	Questionnaire administered at clinic during return visit or in home; self‐reported outcome. Grouping of methods as modern (effective) or traditional was inconsistent with WHO 2013 categories.
Follow‐up length	Low risk	6 months
Follow‐up adequacy	Low risk	Losses to follow up by 6 months: 8.7% treatment 8.7% (137/150); control 18% (123/150);