Exhibit 99.31 MBNA MASTER CREDIT CARD TRUST II SERIES 1997-N KEY PERFORMANCE FACTORS January 31, 1998 Expected B Maturity 11/15/00 Blended Coupon 6.0099% Excess Protection Level 3 Month Average 2.99% January, 1998 2.99% December, 1997 N/A November, 1997 N/A Cash Yield 17.46% Investor Charge Offs 4.43% Base Rate 10.05% Over 35 Day Delinquency 4.85% Seller's Interest 16.09% Total Payment Rate 13.52% Total Principal Balance $34,907,536,752.65 Investor Participation Amount $900,000,000.00 Seller Participation Amount $5,616,202,234.16 *For purposes of calculating the Base Rate and Excess Protection Level, a Coupon of 8.05% (52/360) was used. The Base Rate was calculated using a 52 day monthly period, 12/9/97 - 1/31/98.