Validity of Administrative Databases in Comparison to Medical Charts for Breast Cancer Treatment Data

Table 4

Percent agreement between medical charts and administrative databases for radiotherapy, chemotherapy, and surgery dates.

Date validated	Exact agreement	Agreement ± 1 day	Agreement ± 7 days
Radiotherapy (breast/chest wall radiation)
Start date	96.5%	97.5%	98.7%
End date	83.0%	84.0%	95.4%
Chemotherapy (FEC-D)
Start date	88.7%	93.1%	96.1%
End date	85.4%	90.8%	94.7%
Surgery (partial mastectomy)	96.3%	97.2%	98.2%

ALR, Activity Level Reporting database; CIHI, Canadian Institute for Health Information; FEC-D, Fluorouracil, Epirubicin, Cyclophosphamide, Docetaxel.