condition mean min max ZT0-3 4.46549 4.46549 4.46549 ZT4-7 3.51248 3.51248 3.51248 ZT8-11 2.9429299999999996 2.9429299999999996 2.9429299999999996 ZT12-15 4.494529999999999 4.494529999999999 4.494529999999999 ZT16-19 5.29842 5.29842 5.29842 ZT20-23 4.98482 4.98482 4.98482