condition mean min max ZT0-3 4.45 4.45 4.45 ZT4-7 1.3 1.3 1.3 ZT8-11 40.95 40.95 40.95 ZT12-15 27.35 27.35 27.35 ZT16-19 6.55 6.55 6.55 ZT20-23 50.8 50.8 50.8