Exhibit 99.31 MBNA MASTER CREDIT CARD TRUST II SERIES 1998-C KEY PERFORMANCE FACTORS October 31, 1999 Expected B Maturity 6/16/03 Blended Coupon 5.5638% Excess Protection Level 3 Month Average 6.02% October, 1999 6.20% September, 1999 5.86% August, 1999 5.99% Cash Yield18.61% Investor Charge Offs 4.68% Base Rate 7.73% Over 30 Day Delinquency 5.07% Seller's Interest 9.14% Total Payment Rate14.64% Total Principal Balance$47,636,626,081.62 Investor Participation Amount$750,000,000.00 Seller Participation Amount$4,354,806,563.13