condition mean min max ZT0-3 3.7528550000000003 3.7528550000000003 3.7528550000000003 ZT4-7 2.5896549999999996 2.5896549999999996 2.5896549999999996 ZT8-11 3.38237 3.38237 3.38237 ZT12-15 3.797035 3.797035 3.797035 ZT16-19 4.986515000000001 4.986515000000001 4.986515000000001 ZT20-23 3.670495 3.670495 3.670495