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Analysis of decision aid impact We will quantitatively synthesise the findings from included studies if they are sufficiently homogeneous. We will calculate weighted treatment effects with 95% CIs. We will calculate risk ratios for dichotomous data and mean differences for continuous data. We will pool the results across studies with PDE4B comparable outcome measures using a random-effects meta-analysis. When necessary data are available, we will compute standardised outcome scores to have a mean of 50 with SD of 10 for ease of descriptive comparison. If effect sizes cannot be calculated for the key outcomes due to inadequate information, we will contact the study authors for additional data. For each outcome, data will be synthesised and analysed using the statistical software, RevMan 5.1, as indicated by the Cochrane Handbook of Systematic Reviews of Interventions.47 Heterogeneity will be assessed and considered substantial if the I2 statistic is >50% and the ��2 test p value is to understand its source and conduct quantitative analysis on homogenous subgroups of studies. If relevant, the results of the methodological quality assessment will be used to perform sensitivity analyses to test the effect of omitting studies at high risk of bias. If meta-analysis is not possible, we will perform a narrative analysis and present summary information on all study characteristics and the primary outcome in text and tabular form. We will explore the potential for publication bias visually using funnel plots if 10 or more studies are included.49 If study protocols have been published, we will also compare outcomes reported in the protocol and the published report to assess for selective outcome reporting. Methods: environmental scan (part II) Given the absence of quality standards for conducting environmental scan, our approach was informed by the methods of previous environmental scans about decision aids and/or shared decision-making.50 51 Eligibility criteria Intervention The intervention must be a decision aid, as described above. For the environmental scan only, the decision aid must be written in English and have been created by a source in the USA for women residing in the USA. Data sources and search strategy The Internet will comprise the primary data source for identifying decision aids for inclusion in the environmental scan. The Internet will be used both to identify relevant web-based decision aids and to identify references to non-web-based decision aids. We will execute four searches using the Google Advanced Search ��all these words�� function and the following key word strings: (1) abortion decision aid, (2) abortion options, (3) pregnancy termination options and (4) medical or surgical abortion. We will select ��USA�� in the ��region�� category to refine the search. Cookies will be disabled before the search to avoid inadvertent bias.