condition mean min max ZT0-3 10.092605 10.092605 10.092605 ZT4-7 10.55105 10.55105 10.55105 ZT8-11 2.921475 2.921475 2.921475 ZT12-15 3.39304 3.39304 3.39304 ZT16-19 4.2689699999999995 4.2689699999999995 4.2689699999999995 ZT20-23 8.32854 8.32854 8.32854