condition mean min max ZT0-3 23.2 23.2 23.2 ZT4-7 1.0 1.0 1.0 ZT8-11 3.0 3.0 3.0 ZT12-15 2.95 2.95 2.95 ZT16-19 23.75 23.75 23.75 ZT20-23 43.0 43.0 43.0