Date of birth of the individual, as given on birth certificate or as reported by the individual or their parent. Although registries must collect the full date of birth (see the item Full date of birth), only the year and month will be requested by the TREAT-NMD Global Registry.

Current biological sex of the individual.

ISO 3166-1 alpha-2 two-letter code (e.g. GB for the United Kingdom) of the most recent known primary country of residence of the individual.