condition mean min max ZT0-3 2.55 2.55 2.55 ZT4-7 1.7 1.7 1.7 ZT8-11 9.85 9.85 9.85 ZT12-15 1.15 1.15 1.15 ZT16-19 1.9 1.9 1.9 ZT20-23 3.1999999999999997 3.1999999999999997 3.1999999999999997