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This long-term follow-up study sought to learn more about Standard Days Method® (SDM) use beyond the six or 12 month follow-up period of a series of 14 operations research studies in six countries. The long-term follow-up study followed participants of operations research studies in Benin, Ecuador, Honduras, and two sites in India for up to 24 additional months to determine long-term continuation and effectiveness patterns, reasons for discontinuation, and whether women use the SDM to achieve pregnancy if their fertility intentions change.