condition mean min max ZT0-3 2.6730899999999997 2.405545 3.0909899999999997 ZT4-7 1.9179750000000002 1.9179750000000002 1.9179750000000002 ZT8-11 2.464045 2.464045 2.464045 ZT12-15 5.491569999999999 5.34509 5.63805 ZT16-19 5.385145 5.385145 5.385145 ZT20-23 4.544305 4.544305 4.544305