condition mean min max ZT0-3 29.95 29.95 29.95 ZT4-7 10.8 10.8 10.8 ZT8-11 15.7 15.7 15.7 ZT12-15 9.75 9.75 9.75 ZT16-19 34.95 34.95 34.95 ZT20-23 28.150000000000002 28.150000000000002 28.150000000000002