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15 March 2026
We are pleased to have released new statistical coding and a Stata package to standardise the measurement and reporting of the proportion of days covered (PDC) against the TEN-SPIDERS framework.
The new open-source coding in Stata can be accessed via https://github.com/TEN-SPIDERS
A simple package has also been developed to operationalise the code into a simple executable function within Stata (StataCorp) statistical software.
How to prepare the dataset and variables?
Further information on how to prepare the dataset for the tenspiders Stata code and package is provided in our pre-print manuscript:
Adam C. Livori, Tzu-Yung Kuo, Jenni Ilomaki, et al. Development of a Statistical Package to Standardise the Measurement and Reporting of Medication Adherence Using Claims Data: The TEN-SPIDERS Tool. Authorea. January 15, 2026. doi.org/10.22541/au.176844848.83884959/v1
How to install the Stata package?
Type:
ssc install tenspiders
How to use the Stata package?
*Standard PDC calculation with adjustment for early refills and censoring at death (80% threshold to define high adherence):
use "medication.dta", clear
tenspiders, id(person_id) supply_date(spply_dt) days_supply(qty_sppld) event_date(spply_dt) numerator_start_date(1) death_date(death_date) early_refills(1)
*Adanced PDC calculation with adjustment for early refills, switching and censoring at death (90% threshold to define high adherence):
use "medication.dta", clear
tenspiders, id(person_id) supply_date(spply_dt) days_supply(qty_sppld) event_date(spply_dt) numerator_start_date(1) death_date(death_date) early_refills(1) switching(1) threshold(0.9)
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