condition mean min max ZT0-3 5.89275 5.47377 6.311730000000001 ZT4-7 4.655995 4.655995 4.655995 ZT8-11 4.10274 4.10274 4.10274 ZT12-15 0 0 0 ZT16-19 5.735094999999999 5.735094999999999 5.735094999999999 ZT20-23 5.6892 5.6892 5.6892