condition mean min max ZT0-3 2.0107524999999997 1.9094099999999998 2.112095 ZT4-7 6.088605 6.088605 6.088605 ZT8-11 6.82207 6.82207 6.82207 ZT12-15 0 0 0 ZT16-19 4.296095 4.296095 4.296095 ZT20-23 3.2318550000000004 3.2318550000000004 3.2318550000000004