SHANGHAI, Oct 20 (Reuters) - China maintained its benchmark lending rate for corporate and household loans for an 18th month at its October fixing on Wednesday, matching market expectations. The one-year loan prime rate (LPR) was kept at 3.85%. The five-year LPR remained at 4.65%. Nineteen traders and analysts, or 95% of 20 participants, in a poll conducted this week had predicted no change in either tenor. Most new and outstanding loans in China are based on the one-year LPR. The five-year rate influences the pricing of mortgages. (Reporting by Winni Zhou and Andrew Galbraith; Editing by Chrsitian Schmollinger) Our Standards: The Thomson Reuters Trust Principles.