condition mean min max ZT0-3 1.15 1.15 1.15 ZT4-7 2.5 2.5 2.5 ZT8-11 9.15 9.15 9.15 ZT12-15 2.25 2.25 2.25 ZT16-19 2.1500000000000004 2.1500000000000004 2.1500000000000004 ZT20-23 1.15 1.15 1.15