condition mean min max ZT0-3 1762.4 1762.4 1762.4 ZT4-7 1984.1 1984.1 1984.1 ZT8-11 2428.6 2428.6 2428.6 ZT12-15 2039.25 2039.25 2039.25 ZT16-19 1693.7 1693.7 1693.7 ZT20-23 1902.4 1902.4 1902.4