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. Author manuscript; available in PMC: 2018 Jun 1.
Published in final edited form as: Pharmacoepidemiol Drug Saf. 2017 Mar 19;26(6):676–684. doi: 10.1002/pds.4198

Table 2.

Effect of Breast Cancer Diagnosis on the Proportion of Days of Antidepressant Coverage Using Difference in Difference Models (N=2,284)

Pre-Indexa Post-Indexa Difference in Difference p value
PDC (Mean) 0.01 (±0.01) 0.19
 Cancer group 0.71 (±0.33) 0.70 (±0.36)
 Non-cancer group 0.71 (±0.33) 0.68 (±0.37)
PDC (Median)
 Cancer group 0.86 (0.50–0.97) 0.86(0.49–0.98)
 Non-cancer group 0.85 (0.53–0.97) 0.85(0.45–0.98)
a

Medication adherence was measured through PDC in both 1 year pre- and 1 year post-index date. In cancer group, the index date was the date of receiving a breast cancer diagnosis. In non-cancer group, the index date was a date randomly assigned between 2008 and 2011.