IRCT138903093706N2 IRCT 2011-05-05 Vice Chencellor for Research, Tabriz University of Medical Sciences Comparison of three different approaches for communicating contraceptive effectiveness A randomized controlled trial of communicating contraceptive effectiveness 2011-01-22 anticipated 630 Complete https://irct.ir/trial/3796 interventional Randomization: Randomized, Blinding: Single blinded, Placebo: Not used, Assignment: Parallel, Purpose: Health service research. N/A Womenُs understanding about contraceptive effectiveness. Intervention 1: Group A: asking the participants to look at chart 1 presenting contraceptive effectiveness information (Categorizing the methods into four groups 'least effective', 'effective', 'very effective' and 'most effective' and presenting typical percentage of preganacy in the first year use for each method). Intervention 2: Group B: asking the participants to look at chart 2 presenting contraceptive effectiveness information (Categories). Intervention 3: Group C: asking the participants to look at chart 3 presenting contraceptive effectiveness information (Continuum presenting 'less effective' on the bottom and 'more effective' on the top). http://journals.tbzmed.ac.ir/JCS/Abstract/JCS_20111121083828