condition mean min max ZT0-3 12.80055 11.98285 13.61825 ZT4-7 22.723950000000002 22.723950000000002 22.723950000000002 ZT8-11 17.21895 17.21895 17.21895 ZT12-15 0 0 0 ZT16-19 14.5789 14.5789 14.5789 ZT20-23 21.833399999999997 21.833399999999997 21.833399999999997