condition mean min max ZT0-3 3.0033225000000003 2.0825 3.924145 ZT4-7 5.32 5.32 5.32 ZT8-11 7.63358 7.63358 7.63358 ZT12-15 0 0 0 ZT16-19 6.3547 6.3547 6.3547 ZT20-23 4.8334 4.8334 4.8334