Exhibit 99.31 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-M KEY PERFORMANCE FACTORS January 31, 1999 Expected B Maturity 10/15/02 Blended Coupon 5.1793% Excess Protection Level 3 Month Average 5.85% January, 1999 5.78% December, 1998 6.09% November, 1998 5.69% Cash Yield 18.21% Investor Charge Offs 4.95% Base Rate 7.48% Over 35 Day Delinquency 5.29% Seller's Interest 8.19% Total Payment Rate 14.12% Total Principal Balance $40,086,865,639.98 Investor Participation Amount $750,000,000.00 Seller Participation Amount $3,284,946,121.49