Among persons aged 80 years and older, approximately 90% of the total population is covered by the SPDR,12 the coverage in the younger age groups was lower, approximately 80%. Persons that were not covered by the SPDR have not dispensed a drug during the study period. For each individual alive at the end of the study period, we had information on all prescription drugs dispensed from July 1 to September 30, 2008 (n = 1,347,564).
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