condition mean min max ZT0-3 2.9520600000000004 2.9520600000000004 2.9520600000000004 ZT4-7 2.6374250000000004 2.6374250000000004 2.6374250000000004 ZT8-11 4.450565 4.450565 4.450565 ZT12-15 4.343165 4.343165 4.343165 ZT16-19 6.395490000000001 6.395490000000001 6.395490000000001 ZT20-23 3.182265 3.182265 3.182265