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Table 1 Parameters for each algorithm used to identify comorbidities

From: Modification of claims-based measures improves identification of comorbidities in non-elderly women undergoing mastectomy for breast cancer: a retrospective cohort study

Algorithm Comorbidity Timeframe relative to mastectomy date (in days) Number of inpatient facility medical claims required Interval and number of provider or outpatient facility medical claims required Number of prescription drug (Rx) claims required
Algorithm 1 Diabetes, hypertension, deficiency anemia, smoking, obesity −365 to −1 1+ 2+ more than 30 days apart n/a
Algorithm 2 Diabetes, hypertension, deficiency anemia, smoking, obesity −365 to +7 1+ 2+ more than 30 days apart n/a
Algorithm 3 Diabetes, hypertension, deficiency anemia −365 to +7 1+ 2+ n/a
Smoking, obesity −365 to +7 1+ 1+ n/a
Algorithm 4 Diabetes −365 to +7
−365 to −1 Rx
1+ 2+ 1+
Hypertension −365 to +7
−365 to −1 Rx
1+ 2+ 1+ Rx plus 1 hypertension medical claim
Smoking −365 to +7
−365 to −1 Rx
1+ 1+ 1+
  1. n/a not applicable