Exhibit 99.31 MBNA MASTER CREDIT CARD TRUST II SERIES 1998-C KEY PERFORMANCE FACTORS September 30, 1999 Expected B Maturity 6/16/03 Blended Coupon 5.5395% Excess Protection Level 3 Month Average 5.97% September, 1999 5.86% August, 1999 5.99% July, 1999 6.05% Cash Yield18.00% Investor Charge Offs 4.60% Base Rate 7.54% Over 30 Day Delinquency 4.90% Seller's Interest 6.99% Total Payment Rate14.16% Total Principal Balance$45,780,732,257.76 Investor Participation Amount$750,000,000.00 Seller Participation Amount$3,198,912,739.27