Exhibit 99.13 MBNA MASTER CREDIT CARD TRUST II SERIES 1996-B KEY PERFORMANCE FACTORS December 31, 1998 Expected B Maturity 4/17/06 Blended Coupon 5.8407% Excess Protection Level 3 Month Average 5.73% December, 1998 5.70% November, 1998 5.61% October, 1998 5.86% Cash Yield 18.72% Investor Charge Offs 4.98% Base Rate 8.04% 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 $500,000,000.00 Seller Participation Amount $4,468,784,369.60