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CONTRACEPTION. 1988 Aug; 38(2):157-63.A microcomputer software program called the Menstrual Diary System (MDS) is described which analyzes menstrual diaries by the reference period method, according to WHO guidelines. An IBM compatible microcomputer with floppy or hard disk, at least 256K of memory, and an MS-DOS 2.0 or later operating system is used. Menstrual data consist of entries labeling vaginal bleeding as absent, bleeding or spotting. There are optional parameters for the drive, path, and printer used by the system; user-defined symbols for bleeding patterns; screen characteristics; file management by date and length of data collection (maximum 380 days); and subject identifying information. A data management section permits data entry. The data analysis section follows the reference period method, allowing for within-subject analysis and between-subject analysis. Diary data entered in MDS can be transferred onto standard ASCII file to be used by other packages. Examples of output are provided.