Exhibit 99.13 MBNA MASTER CREDIT CARD TRUST II SERIES 1996-B KEY PERFORMANCE FACTORS March 31, 1999 Expected B Maturity 4/17/06 Blended Coupon 5.2440% Excess Protection Level 3 Month Average 6.07% March, 1999 6.64% February, 1999 5.98% January, 1999 5.60% Cash Yield 19.18% Investor Charge Offs 5.12% Base Rate 7.42% Over 35 Day Delinquency 4.94% Seller's Interest 6.34% Total Payment Rate 14.77% Total Principal Balance $40,628,355,078.94 Investor Participation Amount $500,000,000.00 Seller Participation Amount $2,576,435,560.45