Exhibit 99.26 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-F KEY PERFORMANCE FACTORS December 31, 1997 Expected B Maturity 6/17/02 Blended Coupon 6.5693% Excess Protection Level 3 Month Average 5.26% December, 1997 5.29% November, 1997 5.00% October, 1997 5.49% Cash Yield 18.25% Investor Charge Offs 4.64% Base Rate 8.32% Over 35 Day Delinquency 4.81% Seller's Interest 16.15% Total Payment Rate 13.29% Total Principal Balance $34,934,847,924.76 Investor Participation Amount $706,000,000.00 Seller Participation Amount $5,643,513,406.27