The statistics include all individuals with a CPR number who redeemed prescriptions during the year in question. Municipality of residence is derived from the population register as of 1 January of the relevant year. If a person does not have a registered place of residence as of 1 January, the municipality is recorded as ¿Unknown region¿. When calculating the indicator "Prescriptions per 100 inhabitants" the population register as of 1 January is used to determine the number of inhabitants. In the population register, the place of residence is known for all individuals; therefore, no value for "Unknown region" exists for this indicator. Age is calculated as of 31 December of the relevant year.