condition mean min max ZT0-3 3.8280200000000004 3.7685750000000002 3.887465 ZT4-7 1.749065 1.749065 1.749065 ZT8-11 2.17873 2.17873 2.17873 ZT12-15 0 0 0 ZT16-19 3.05011 3.05011 3.05011 ZT20-23 3.6406650000000003 3.6406650000000003 3.6406650000000003