Table 1.

Clostridium difficile Infection Cohort Construction

Inclusion/Exclusion Criteria	No. of Subjects
Diagnosis of CDI from 1 July 2010 to 30 June 2014 (the earliest diagnosis was the index date)	146942
Continuous health plan enrollment for 12 mo before and 6 mo after the index date (subjects who died during the follow-up were included in the study)	59837
No diagnosis of CDI during 84 d before the index date	59262
No multiple primary CDI episodes during the follow-up period	56646
No invalid cost data (eg, negative values or extremely large values)	55504

Abbreviation: CDI, Clostridium difficile infection.