condition mean min max ZT0-3 5.963545 5.356405 6.570685 ZT4-7 2.99411 2.99411 2.99411 ZT8-11 2.48796 2.48796 2.48796 ZT12-15 0 0 0 ZT16-19 3.61564 3.61564 3.61564 ZT20-23 3.63387 3.63387 3.63387