Journal Article

The pitfalls of using selective data to represent the effectiveness, relevance and utility of the Standard Days Method (SDM) of contraception

The article, “Does the evidence support global promotion of the calendar-based Standard Days Method of contraception?” by Marston and Church claims to assess evidence about the effectiveness of the Standard Days Method (SDM) method of contraception. As readers and contributors to Contraception, we are concerned about the author's seeming disregard for accurate representation of data throughout this article. By referring to the method as calendar-based, the authors imply that SDM is no different from the rhythm method.