condition mean min max ZT0-3 4.20662 4.20662 4.20662 ZT4-7 3.0916499999999996 3.0916499999999996 3.0916499999999996 ZT8-11 2.947795 2.947795 2.947795 ZT12-15 2.655125 2.655125 2.655125 ZT16-19 3.0115 3.0115 3.0115 ZT20-23 4.806794999999999 4.806794999999999 4.806794999999999