This excerpt taken from the CVS 8-K filed Oct 30, 2008.
EBITDA and EBITDA per Adjusted Claim
The Company defines EBITDA as earnings before interest, taxes, depreciation and amortization (and excluding merger and integration related costs). We define EBITDA per adjusted claim as EBITDA divided by adjusted pharmacy claims. Adjusted pharmacy claims normalize the claims volume statistic for the difference in average days supply for mail and retail claims. Adjusted pharmacy claims are calculated by multiplying 90-day claims (the majority of total mail claims) by 3 and adding the 30-day claims. EBITDA can be reconciled to operating profit, which we believe to be the most directly comparable GAAP financial measure.
Following is a reconciliation of operating profit to EBITDA: