Document Classification

Section Type: RESULTS

Text: Durations of exposure were 87. 05 + / - 6. 09 (SEM), 82. 57 + / - 5. 84, 64. 85 + / - 5. 43, and 62. 61 + / - 3. 74 hours, respectively ; the 24-hour decline rates were 10. 26 % + / - 1. 84 %, 14. 50 % + / - 1. 53 %, 21. 82 % + / - 1. 71 %, and 19. 00 % + / - 1. 65 %, respectively ; the overall decline rates over the whole exposure period were 0. 47 % + / - 0. 03 %, 0. 52 % + / - 0. 04 %, 0. 71 % + / - 0. 05 %, and 0. 75 % + / - 0. 04 % per hour, respectively.