Exhibit 99.26 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-F KEY PERFORMANCE FACTORS December 31, 1998 Expected B Maturity 6/17/02 Blended Coupon 6.5027% Excess Protection Level 3 Month Average 5.93% December, 1998 5.91% November, 1998 5.78% October, 1998 6.10% Cash Yield 18.72% Investor Charge Offs 4.98% Base Rate 7.83% Over 35 Day Delinquency 4.96% Seller's Interest 10.83% Total Payment Rate 13.62% Total Principal Balance $41,270,703,888.09 Investor Participation Amount $706,000,000.00 Seller Participation Amount $4,468,784,369.60