condition mean min max ZT0-3 12.950000000000001 12.950000000000001 12.950000000000001 ZT4-7 2.6 2.6 2.6 ZT8-11 13.15 13.15 13.15 ZT12-15 3.2 3.2 3.2 ZT16-19 34.25 34.25 34.25 ZT20-23 18.8 18.8 18.8