R/attributes-op.R
ageAtStart.Rd
Age at era start attribute (for era and period domains)
ageAtStart(op)
an opAttribute object (numeric or integer) defining the age comparison
An attribute for use in conditionEra(), drugEra(), doseEra(), observationPeriod().
conditionEra()
drugEra()
doseEra()
observationPeriod()