condition mean min max ZT0-3 9.65 9.65 9.65 ZT4-7 9.1 9.1 9.1 ZT8-11 2.55 2.55 2.55 ZT12-15 3.95 3.95 3.95 ZT16-19 20.4 20.4 20.4 ZT20-23 5.1499999999999995 5.1499999999999995 5.1499999999999995