condition mean min max ZT0-3 9.25 9.25 9.25 ZT4-7 1.4 1.4 1.4 ZT8-11 34.55 34.55 34.55 ZT12-15 6.75 6.75 6.75 ZT16-19 4.1 4.1 4.1 ZT20-23 9.95 9.95 9.95